7 Best Road Running Shoes in 2024

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7 Best Road Running Shoes in 2024

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The number of road running shoes is three times larger compared to trail running shoes. Thus, buying a pair can be an overwhelming task, especially if you are new to running.

We have tested road running shoes in our lab and on a variety of wear tests. If you want nothing but the best, see our top picks from different categories of road shoes. From a versatile daily trainer and a budget shoe to a premium speed and racing option, we have the finest choice for you.  

This guide dives into the nitty-gritty of road running shoes. Read over to learn what to specifically pay attention to when getting new road shoes!

How we test road running shoes

At RunRepeat we know the difference between good and great shoes. 

How? Thanks to our independent shoe testing lab and a meticulous approach to reviewing running shoes:

  • We use durometers, scales, calipers, a custom smoke machine, and even a saw to cut each shoe open and measure every aspect of it, from upper breathability to outsole durability.
  • As a team of dedicated shoe fanatics, we run 30-50 miles a week to test every new release from over 30 brands.
  • We purchase all running shoes with our own money to ensure transparency.

Basically, the best ones end up on this list.

Best road running shoes overall

ASICS Novablast 5
92
Superb!

What makes it the best?

After long hours in the lab and countless miles of pounding the pavement, ASICS Novablast 5 emerged as the best road running shoe. It’s a neutral trainer with unmatched comfort, versatility, and reliable support for any pace and distance.

We can’t get enough of its luxurious cushioning. Running for long hours on tough surfaces feels pleasant because of the plush and decadent foam. It combines maximum height with pillowy goodness. It stands tall at 40.9/33.5 mm, with a durometer measurement 38.4% softer than average. Despite this, our runs still had a lot of pop for faster efforts.

Even with the thick slab of foam beneath us, Novablast 5 delivers a smooth and stable ride by providing an extra 8.3/6.9 mm width in the forefoot and heel for safe landings. In terms of longitudinal movement, this pair moves fluidly with our motions, which is a plus for comfort. Our bend test shows it’s 32.2% more flexible than average.

After reaching double-digit miles, we were impressed to see that the outsole had purely visual and very minor scratches—the plushness and bounce remained the same. When put against our Dremel test, Novablast 5 establishes its longevity by showing less wear than average.

Unfortunately, the upper offers limited ventilation for humid weather. We recommend using this pair in cooler temperatures only to enjoy its full potential.

Pros

  • Improved energy return with all-new foam
  • Plushiest foam in a Novablast yet
  • Keeps the same price as v4
  • Higher stack height for extra cushioning
  • Enhanced flexibility
  • Lighter than its predecessor
  • Best Novablast ever for wide feet
  • Exceptional weight-to-cushion balance
  • Works for short, medium and long runs

Cons

  • Lacks grip on wet surfaces
  • Breathability could be improved
  • Toebox durability
Full review of ASICS Novablast 5

Best road running shoes for daily training

Nike Pegasus 41
88
Great!

What makes it the best?

After upgrading itself over 40 years, the Nike Pegasus 41 asserts itself as a reliable training partner—seamlessly combining remarkable comfort, steady support, and exceptional versatility. Following extensive runs and thorough lab analysis, we confidently name the Pegasus 41 as the top daily trainer for road running.

From short to long runs, the combination of the ReactX foam and the two Air Zoom units delivers a cushioned and bouncy ride. Our durometer shows the foam is a plush 15.8 HA for sustained underfoot relief.

This Peg has subtle guiding elements to keep our feet in the right position and direction. Other than the midsole sidewalls, the shoe has a rocker geometry that brings us forward effortlessly. The toe spring also feels more pronounced, making the ride more enjoyable.

Thankfully, Pegasus 41 retains the classic natural running experience by keeping its midsole flexible. Our bend test shows it’s 34.0% more bendable than average. Because it barely has resistance, it’s easy to use for other activities such as walking and cross-training.

While it excels as a versatile shoe, it doesn't specialize in any one area. Runners seeking faster racing or more comfortable easy runs may prefer other options.

Pros

  • Enhanced for heel strikers
  • New ReactX foam!
  • Improved breathability
  • Plush upper
  • Good durability
  • Several stability enhancements
  • Newly designed rocker and bevel
  • Solid performance
  • Superior lockdown
  • Sustainable features

Cons

  • Not ideal for forefoot strikers
  • Price increased by $10
  • Worse than the v40 in cold temperatures
Full review of Nike Pegasus 41

Best road running shoes for speed training

What makes it the best?

PUMA Deviate Nitro 3 took our speed sessions to the next level. Pumping up our adrenaline, its carbon PWRPLATE exudes incredible energy return, its buttery foam oozes pure delight, and its outsole promises unwavering traction. With the lab backing up our experience, DN3 is our ultimate speed trainer for road running.

This supertrainer brings the power we need to sustain faster runs. The carbon plate, nestled between the foam, sprung us off pleasantly with every stride for efficient energy use. Our bend test reveals the midsole is 22.3% stiffer than average, generating the vibrant pop in our runs.

Deviate Nitro 3 ensures we not only run fast, but far too. It keeps the cushioning soft for a delicate sensation underfoot, making us indulge in its low-impact ride. Our sliced shoe shows a dual-foam set-up: a soft and highly responsive 19.0 HA top layer and an ever gentler 18.0 HA foam below.

The outsole proves its reliability on any pavement we tested—wet roads, loose ground, and even light trails. Its PUMAGRIP ATR delivers solid traction and measures a soft 72.0 HC, 10.4% below standard.

Our runs tell us this pair demands proper running form since its race-oriented, narrow design lacks support for those with extra stability needs. Runners who need more guidance should try other shoes.

Pros

  • Exceptional grip on all surfaces
  • Fantastic cushioning
  • Competitively priced
  • Responsive carbon plate
  • Adapts well to all paces
  • Enhanced knit upper
  • Ideal for tempo workouts
  • Great at navigating tight turns

Cons

  • Outsole durability
  • Minor increase in weight
  • Ventilation could be better
Full review of PUMA Deviate Nitro 3

Best road running shoes for race

Nike Vaporfly 3
87
Great!

What makes it the best?

Think devilish speed, heavenly comfort, and a cloud-like feel: this is exactly what we experienced after running a fair share of races in the Nike Vaporfly 3. This hypersonic shoe delivers unforgettable and unmatched performance in and out of the lab, securely setting our personal bests and winning the best racer title among road-running shoes.

Each stride is ignited with limitless energy from its magnificent core—the responsive ZoomX foam and the rigid FlyPlate. Both elements deliver smooth turnovers and sustain our power over long-haul efforts. The stacked and soft cushion embraced our feet with buttery goodness, as our durometer confirmed it’s 30.3% softer than average. The spoon-shaped carbon plate ensures stability and power through its rigidity. Our bend test confirms it’s 92.1% stiffer than average, shining further as we run faster.

We felt like floating through countless miles as VF3 dissipated into our feet with its barely-there weight. Our scales reveal a mere 6.7 oz (190g), transcending even the average supershoe (7.4 oz/210g). Running on clouds is an understatement as it offers top-tier breathability through its extremely ventilated Flyknit upper that’s designed intently for airflow.

The outsole provides exceptional traction on both wet and dry surfaces. However, its waffle-like pattern and midsole cutout accumulated small debris during our runs. We recommend avoiding pebbled paths for a smoother running experience.

Pros

  • Exceptionally breathable upper
  • Outstanding ZoomX cushioning
  • Superb choice from the mile to the marathon
  • Impressively low weight
  • Enhanced stability
  • Plush, cloud-like foam
  • Upgraded outsole for better grip

Cons

  • Uncomfortably large tongue
  • The heel is still too narrow
Full review of Nike Vaporfly 3

Best road running shoes with plush cushioning

What makes it the best?

The Gel Nimbus 26 truly embodies plush cushioning. It stood out among the road-running shoes we tested with its pillowy embrace and gentle yet stable landings. Our lab numbers only verified what our feet already knew—comfort is #1 for this ASICS shoe.

Running on clouds feels like an understatement. The Gel Nimbus 26 was immensely comfortable during all our runs, regardless of distance. The secret to this luxurious comfort lies in its super soft and super thick midsole. Our lab reveals its 40.4/33.5 mm mega stack stands 21.6% softer than average, erasing the harshness of the ground. Further dampening landing impact is the PureGEL technology located in the heel.

The Gel Nimbus 26 is also stable, adding to our confidence as we soared through the roads. Its vast platform is complemented by a stiff construction that resists excessive lateral movements and twists. Our manual assessment reveals a solid 5/5 rating for torsional rigidity, effectively avoiding ankle rolls.

While it provides next-level comfort, it lacks responsiveness for fast days. We recommend exploring other cushioned options that can handle speed sessions.

Pros

  • Premium all-around comfort
  • Enhanced toebox design
  • Exceptional durability
  • Best-in-series outsole
  • Ideal for long distances
  • Superb knit upper
  • Surprisingly stable
  • A dream for heel strikers

Cons

  • Increased weight
  • Limited energy return
  • Tongue lacks padding
Full review of ASICS Gel Nimbus 26

Best stability road running shoes

What makes it the best?

The ASICS Gel Kayano 31, our top pick for the best stability road-running shoe, achieves the sweet spot between comfort and support. Featuring a plush mega-stack combined with the innovative 4D Guidance System, this trainer delivers a forgiving yet surefooted ride. 

The main star is the 4D Guidance System, consisting of a soft foam strategically placed beneath each arch to adjust to the contours of our foot. It's our very own custom-made support and protection against unwanted movements. Another stability feature is the wider-than-average midsole that instills a sense of security and confidence with each landing. What's remarkable is how these stability elements remain unobtrusive yet reliably emerge when needed.

While most stability shoes are firm and grounded, GK31 deviates from the standard with its tall and plush FF Blast+ cushioning. Our lab reveals the foam rises 39.3/27.8 mm tall and is 27.1% softer than average. This heavenly combination dampens landing impact and spoils our legs with buttery goodness to last long.

Diverging from the rigidity often associated with stability and maximalist shoes, the GK31 is highly bendable. Our 90-degree test confirms that it’s 14.4% more flexible than average, enhancing comfort and a natural feel. 

Unfortunately, we can’t say the same in the weight department. Our scales reveal it’s 10.4 oz (295g), noticeably heavier than the 9.4 oz (266g) average.

Pros

  • Excellent stability
  • Ideal for heel strikers
  • Good breathability
  • Comfortable and roomy upper
  • Great for easy paces
  • Maximalist cushioning
  • A bit lighter than v30
  • Plush FF Blast+ foam

Cons

  • Big and clunky
  • Not versatile at all
  • Outsole needs improvements
Full review of ASICS Gel Kayano 31

Best budget road running shoes

Saucony Axon 3
89
Great!

What makes it the best?

The Saucony Axon 3 is a reliable all-rounder, proven by our lab and run tests. Aside from its cushioned platform and impressive durability, it’s a versatile trainer that doesn’t break the bank. No doubt, it’s our best budget road running shoe.

At only $100, Axon 3 offers value beyond its price tag. It undercuts its competitors as the average daily trainer costs $130. It can keep up with its more expensive counterparts as it showed strong performance in our runs.

The Axon 3 conquered all types of runs. It’s comfortable enough for easy runs yet nimble enough for tempo days when we want to pick up the pace. Not only is it light in the pocket, but also on foot. Our scales show it’s only 8.6 oz (244g), 12.5% lighter than the average daily trainer. Our durometer also confirmed our sensations — the cushion is 22.5% softer than average, explaining its all-day comfort. 

After running around 100 miles in these shoes, there were no visible signs of wear and tear — especially in the outsole. Its 3.9 mm rubber is 0.7 mm thicker than the average, making it tough enough to take the abuse of training blocks.

Given the shoe’s low-drop geometry, we recommend excessive rearfoot strikers to explore other options.

Pros

  • Incredible value at only $100
  • Significant weight reduction from version 2
  • Impressively cushioned with PWRRUN foam
  • Fantastic durability
  • Suitable for quicker paces
  • Excellent as a daily workhorse
  • Lovely upper
  • Works for short and long runs

Cons

  • Probably too stiff for very relaxed runs
  • Slightly narrower forefoot than before
Full review of Saucony Axon 3

3 most important things for road running

Running on the roads means you most likely need a cushioned shoe that will provide enough impact protection for your feet given how hard the surface is, a good grip (for wet or dry weather, depending on your climate), and a durable outsole that can withstand the constant traction against the hard asphalt or concrete.

road-running-shoe-profile-picture.jpg

However, it’s not just about those 3 features. Many things depend on your pace, distance, foot strike, pronation, and so on. We will cover the general guidelines here, but keep in mind that outliers exist. There are people who run in flat, non-cushioned runners on the roads, but it’s not common, and we especially don’t recommend it to beginners. 

The importance of cushioning in road running shoes

There are many things to be considered when we talk about cushioning: 

  1. stack height: it tells us how high off the ground the heel and the forefoot are. More cushioning means more impact protection which is highly recommended given the hard running surface. But, more cushioning also means less ground feel. 
  2. heel drop: it tells us the difference in height between the heel and the forefoot. It is very important to know the heel drop and choose one that won’t aggravate your past or current injuries 
  3. the softness of the cushioning: we measure it with a durometer and many runners directly correlate the softness of the midsole with the overall shoe comfort 
  4. the type of foam: standard or premium? This choice directly dictates the responsiveness, durability and price of the shoe. 

If you’re a beginner, we recommend a heel stack height of at least 30mm and a heel drop in the 8-12mm range

More impact protection or more ground feel? 

Stack height tells us how high off the ground we are. In our lab, we use a digital caliper to measure both the heel stack height and forefoot stack height. 

stack-height-measurement-road-running-shoes.jpg
Measuring the heel stack height (left) and forefoot stack height (right)

To honor the guidelines from WorldAthletics, we cut the shoe in half first. This is the only way to properly measure the stack height at the center of the shoe and at the 12% and 75% of the inner shoe length. 

Your heel can sit on anything from 7mm to 47 mm high base (based on our current lab measurements). Now, that’s a big variation. The current average sits and 33.8 mm. 

low-to-the-ground-and-high-road-running-shoes.jpg
Very low to the ground (left) shoe vs a high-stacked one (right)

We recommend cushioned running shoes (heel stack height of at least 30-35mm) if you are a beginner, if you are a heel striker and want as much impact protection as possible,or if you’re a heavy runner. 

You should know that 40mm heel stack height is the legal limit for official races, so if you’re planning on running in a shoe that’s higher than that, check the rules of the race you might participate in first. 

We recommend running shoes that are low to the ground (heel stack height less than 30mm) if you’re more experienced, if you plan to do shorter runs, if you love the ground feel. 

Road running shoe with 23.8 mm at the heel

We don’t recommend minimalist or barefoot running shoes to beginners. Choose these shoes if you’re an experienced runner, if you want to strengthen your foot muscles by first walking in those shoes and then gradually getting used to running in them, and keep in mind that forefoot strikers could have an easier transition than heel strikers. 

minimalist-running-shoe-rolled-up.jpg
Maximal flexibility found in a minimalist running shoe is possible because there's almost no cushioning or stiffness

Why heel drop must be taken into account

Heel-to-toe drop is often forgotten about when shopping for new running shoes so here’s why it should not be like that: 

  1. Sudden big changes in heel drop (4mm difference or higher) can lead to muscle strain or injury
  2. Big changes in heel drop can aggravate current injuries
  3. Running in shoes with different heel drops can actually help you strengthen different leg and foot muscles
heel-drop-stack-height-variation.jpg
Different stack height / heel drop variations are possible 

There are many variations between stack heights and heel drops, and although it might seem that zero drop is exclusive to minimalist running shoes, Altra is here to beg to differ. The same goes for the low drop, as we have many Hoka models with low heel drops, yet those shoes are very high off the ground. 

Non-written industry standard sits around 10mm. This is what we recommend to beginners (range between 8 and 12 mm). However, you should know that zero-drop shoes will use the most out of your foot muscles. Low-drop shoes will utilize your calves and Achilles and higher-drop shoes will utilize hip muscles and thighs. 

zero-drop-shoe-cut-in-half.jpg
Trying on the zero-drop shoe for the first time can feel as if it has a negative drop

If you plan to transition to low-drop or zero-drop shoes, you should do it very gradually. It takes time. Often, forefoot strikers with neutral pronation do it easier than heel strikers with overpronaiton. In case you want to learn more about heel drop, read our insanely detailed Ultimate guide on heel to toe drop

Lab tests: softness of road running shoes

Is softer always better? Definitely not. 

Soft foams can feel very comfortable, but they can also be a) very dull, meaning your feet will sink in and have difficulties coming back up, or b) very unstable due to all the softness. 

Very soft and unstable midsole

On the other hand, we have firmer foams that offer more stability and protection. 

Squeezing the soft foam and the firm foam in RunRepeat lab

Firm vs. soft midsole on the curb test

In our shoe lab, after cutting the shoes in half, we stick a shore A durometer into the foam to measure the softness. This is the only right way to do it. Many testers do it on the outside but, keep in mind that foams come with paint on the outside or protective layers that can give very different (wrong!) softness readings. 

durometer-closeup-midsole-softness-road-running-shoes.jpg

The higher the number on the durometer, the firmer the foam. Knowing this, it’s easy to understand which shoe is firmer or softer. 

Firmer midsoles can often be found in stability running shoes because runners with mild to excessive overpronation appreciate any support they can get. And, if we’re analyzing a dual-density midsole, we take both durometer measurements. 

If this topic peaks your interest, you can dig deeper and read our very detailed guide Soft vs. Firm Running Shoes

Foam: standard or premium 

In running, there are 3 shoe groups based on the pace: daily trainers, speed shoes and competition shoes. What does that mean in terms of cushioning?

Daily trainers are used for easy runs, recovery runs, jogging, and racking up the miles. These shoes are usually very cushioned and very comfortable. However, given that the pace remains slow, the foams don’t have to be super responsive (and, therefore, expensive). Usually, we see standard foams implemented in daily trainers

premium-foam-vs-standard-foam-looks-road-running-shoes.jpg
Shoes with a premium and standard foam cut in half: no way to tell the difference just by looking at them

Standard foams are usually very affordable, durable, and stable. But, they can feel dull and not responsive, they don’t do well in winter (they firm up a lot), and, when covering the same mileage in standard foams and premium foams, it can feel more tiring in the standard ones. They are not famous for leg-saving features. 

In race shoes, on the other hand, the best you can get is premium foam. Combine it with a carbon plate, and you’ve got yourself one of the most responsive shoes on the market. 

Premium foams offer an impressive energy return, feel super fun (and bouncy), and feel less tiring for the feet and legs. On the flip side, they are expensive and often not durable. 

When it comes to the choice of foam, it all depends on your primary goal. Brands develop their own foam combinations, so below are the most common ones, along with their strengths and weaknesses (taken from our in-depth guide on foams). 

Pros and cons of premium foams

Brand Foam Top feature Major drawback
Nike ZoomX (Pebax) Energy return Durability
ASICS FF Turbo (Nylon) Durability Weight
ASICS FF Turbo+ (PEBA) Performance Stability
Adidas Lightstrike Pro (TPEE) Super-durable all-rounder Break-in needed
Saucony PWRRUN PB (Pebax) Comfort Energy return
Saucony PWRRUN HG (Pebax) Performance Maybe too firm for some
Puma Nitro Elite (PEBA + EVA / A-TPU) Durability Energy return
Hoka Unnamed (PEBA) Responsive Impact protection
Decathlon VFOAM (Pebax) / VFOAM PLUS (Pebax + EVA) Affordable Performance
Mizuno Enerzy Lite+ (PEBA) Bounce Stability
Reebok Floatride (Pebax) Low price Energy return
Li-Ning BOOM (Pebax) Bounce Hard to find
On Helion HF (Pebax) Energy return Durability
New Balance FuelCell (Pebax) Softness Weight

Pros and cons of standard foams

Brand Foam Top Feature Major drawback
New Balance FuelCell (TPU / EVA)  Cloud-like feel Stability
Skechers HyperBurst (EVA) Lightweight Energy return
Skechers HyperBurst Pro (TPU) Responsive Heavy
Nike React / ReactX (TPE + EVA) Versatile Dull
Nike Phylon / Cushlon (EVA) All-rounder Energy Return
Adidas Boost (TPU) Comfortable Heavy
Adidas Light Boost (TPU) Weight Boring
Adidas Lightstrike (EVA / TPU) Stability Too firm
Adidas Dreamstrike+ (Bio-based PEBA) Versatile Weight
ASICS FF Blast / FF Blast+ (EVA + OBC) Bounce Durability
ASICS FlyteFoam (EVA) Lightweight Energy return
Brooks DNA Loft (EVA) / DNA Flash (EVA) Lightweight Dull
Brooks DNA Amp (TPU) Energy return Heavy
Brooks BioMoGo DNA (EVA) Comfort Energy return
New Balance Fresh Foam / Fresh Foam X (EVA / EVA + PEBA) Softness Mushy
Merrell Super Rebound Compound (EVA) Durable Energy return
Saucony PWRRUN (EVA + TPU) Versatile Boring
Saucony PWRRUN+ (TPU) Energy return Weight
Hoka ProFly (EVA) Comfortable Energy return
Hoka ProFly+ (EVA) Responsive Durability
On Helion (EVA + OBC) Unique Firm
Altra Ego (EVA) Fun Energy return
Altra Ego Pro (TPE) Bouncy Cushion
Puma Nitro (TPEE / PEBA) Responsive Durability
Puma Profoam / Profoam Lite (EVA) Durability Cushion
Under Armour HOVR (EVA + OBC) Stability Firm
Mizuno Enerzy (TPE) All-rounder Bounce
Mizuno Enerzy Core (TPE) Softness Durability
Mizuno Enerzy Lite (Nylon) Lightweight Cushion
Mizuno Enerzy NXT (EVA) Soft Stability
Salomon EnergyFoam (EVA + OBC) Stability Boring
Salomon EnergyCell / EnergyCell+ (EVA) Durability Firm
Reebok FloatRide Energy (TPU) Price Heavy
TOPO ZipFoam (EVA + TPU) Energy Return Heavy
Inov-8 Powerflow Pro (EVA) Comfort Bounce

How padded are road running shoes?

This mostly depends on the pace. Daily trainers are usually very padded to make your ride as comfy as possible. We’re talking about tongue padding, heel collar and heel counter padding. 

Very thin tongue (race shoe, left) vs a very padded tongue (daily trainer, right)

If the thickness of the tongue is something you care about, you most likely experienced a lace bite. A lace bite happens when you tighten the laces and feel the pressure, or the bite, on the instep.

not-padded-vs-padded-running-shoe.jpg

Thicker tongues lower the possibility of a lace bite. 

Measuring the thickness of the tongue in RunRepeat lab

As we see below, the thickest tongues are found in daily trainers.

The opposite side: the thinnest tongues are found in competition shoes. 

On the other hand, we have race shoes that are often not padded at all. This does not mean they are not comfortable; a premium sock-like upper can be very soft. But these shoes often cut back on the tongue and heel padding to cut weight. A thin upper definitely screams race and is more aggressive than a daily trainers’ thicker upper with a lot of padded details. 

Sock-like heel in a race shoe (left) vs. a very padded heel collar with a plastic heel counter at the back in a daily trainer (right)

The most padded heels, along with the heel counters, are found in stability running shoes because stabilizing the heel for overpronators is of utmost importance. 

Nailing the grip in road running shoes

First, you should know whether you’ll be mostly running in dry or wet conditions. Just like in car tires, it matters for traction. 

wet-weather-outsole-comparison.jpg
Outsoles for wet conditions: bad (exposed midsole, no channels) on the left, OK in the middle (2 channels, great grooves), superb on the right (lugs, grooves, channels)

For wet weather, we suggest outsoles that have a lot of grooves and channels and outsoles that are mostly or completely covered with rubber with no or as little as possible exposed midsole. For dry weather, the tread pattern does not have to be complicated.

But there are other things we will discuss: 

  1. Placement of the rubber
  2. Rubber coverage 
  3. Outsole hardness 
  4. Outsole thickness

In race shoes that are mainly made for forefoot strikers, you’ll find rubber placed only at the front. If you’re a heel striker, you might be able to use these shoes anyway, but the exposed midsole that you’ll land on will wear out significantly sooner than the rubber and it definitely won’t grip nearly as well. 

rubber-for-forefoot-strikers-road-running-shoes.jpg
Rubber placement focused at the front (not for heel strikers)

When it comes to rubber coverage, we recommend the maximum if you plan to run mostly on wet surfaces. The exposed midsole will just slip and slide. However, in dry weather and in race shoes, having exposed midsole or even chunks of the midsoles cut out can help with increasing the flexibility of the shoe, shedding the shoe weight and, therefore, improving the runner’s speed. 

more-rubber-coverage-outsoles-road-running-shoes.jpg
Noticeable exposed midsole with no cutouts (left), channel-like cutouts (middle) and 2 very deep cutouts (at the center and at the heel) on the right

If you want to take an even deeper dive into this topic, we’ve got you covered: In-depth insights into running shoe outsoles (road & trail)

In our shoe lab, we measure the hardness of the rubber. Harder rubber is more durable and protective, while softer rubber is stickier and more flexible. 

rubber-hardness-road-running-shoes.jpg
Measuring the hardness of the rubber with a shore C durometer

This table perfectly illustrates it: 

Shoe

Pace

Hardness (HC)

ASICS Metaspeed Edge+

Racing

55.0

Saucony Endorphin Pro 3

Racing

60.5

Adidas Adizero Adios Pro 2

Racing

67.0

Nike Air Winflo 9

Daily trainer

92.8

Saucony Endorphin Shift 2

Daily trainer

91.0

ASICS GlideRide 3

Daily trainer

87.0

Looking at the table, it’s easy to see that daily trainers have much harder outsoles as they are made to last and, as many have experienced, including us, some last even up to 1,000km. On the other hand, race shoes have to be as light as possible so their outsoles are sticky (softer) and very thin

We measure the thickness of the outsole rubber in our lab as well. The thicker the outsole, the more damage it can withstand before getting to the midsole. 

Outsole thickness measurement

Thickest outsoles are found in daily running shoes as the table below proves it: 

Contrasting numbers show us that the thinnest outsoles are found in competition or tempo shoes: 

Outsole durability in road running shoes 

Above, we covered the thickness of the outsole and the hardness. The next logical step is, of course, durability. While it’s intuitive to think that for a rubberto last long it has to be very thick and very hard.. It turns out that’s not always the case. 

We test durability using our Dremel. We standardized the test, so every outsole is met with a Dremel at the same speed (RPMs), pressure and duration. 

Testing the durability of the outsole in RunRepeat lab

The bigger the dent, the less durable the outsole. We use a tire tread gauge to precisely measure the depth of the dent, so it’s easy to see how far the Dremel went. 

durability-outsole-road-running-shoes.jpg
Different levels of damage done by the Dremel

Thicker outsoles also make the shoe less flexible which leads us to the flexibility of road running shoes. 

Flexibility of road running shoes

Flexible running shoes are great when you want to experience a more natural running feel. They bend more and it feels good because our feet naturally bend as well. 

The difference between a stiff (left) and a flexible (right) running shoe on the torsional rigidity test

However, stiff running shoes can bring more stability, support, and responsiveness. The latter is most often related to running shoes with a carbon-fiber plate. 

carbon-plate-cut-from-the-road-running-shoe.jpg

And definitely, they are very stiff and very propulsive! 

Measuring the stiffness of the shoe in RunRepeat lab

In our lab, we use a digital force gauge to bend the shoe to 90 degrees and measure how much force it took us to do that. More force = stiffer the shoe. We also twist the shoe in our hands and assign it a 1-5 rating where 5 is the most torsionally rigid.

In case you want to make a clear distinction between soft and flexible or firm and stiff, read our guide Flexible vs. Stiff Running Shoes

Super stable or super fast? 

You will rarely have both in running shoes. This is because premium race shoes usully have very tall and narrow midsoles, while super stable shoes have a wider base. 

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Tall and narrow base (1, 2) vs. a tall and wide base (3, 4). 3&4 are much more stable than 1&2

When we say “stable” here, it applies to both a) stability, features that are wanted for overpronators and b) overall stable feel that’s found in neutral shoes as well. Because of this, there aren’t stability race shoes, its features would add too much weight and, therefore, slow the runners down or feel bottom heavy. 

The biggest tell whether the shoe is stable is the base's width. The wider the base, the more planted the landings and toe-offs. In our shoe lab, we measure it in 2 places: at the forefoot and at the heel. This way, both forefoot and heel strikers can be at peace. 

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Measuring the width of the base at the forefoot (left) and heel (right) in RunRepeat lab

If you’re a forefoot striker, you will most likely care about the width of the base at the forefoot: 

In case you heel strike, it’s important that the landing is not wobbly but planted. The wide base at the heel makes sure of that: 

Weight of road running shoes 

Almost everything discussed above impacts the weight of the shoe. What makes shoes heavier: stability features, wider midsoles, full-rubber outsoles, padding. What makes shoes lighter: lighter foams, cutting down on padding, midsoles that have chunks cut out for flexibility and cutting the weight down, less rubber on the outsoles, thinner rubber, etc. 

Weighing a road running shoe in our lab

Lighter running shoes can improve your running time but if that means less cushioning that you need on recovery days or less padding that keeps your feet comfortable or less stable due to the lack of rubber… it’s important to know which price you’re paying. 

Wide toebox in road running shoes

Your toes should not be cramped in the toebox. Some runners can push through it, usually in cross country shoes or track spikes, but then we’re talking about very short sprint distances. 

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Foot-shaped design (left) vs. a common pointy toebox (right)

For any longer distances, comfort is of utmost importance. If your toes are usually cramped and need more room, you can always consult our lab measurements to get the sense of how wide the toebox is. 

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Using a digital caliper to measure the width of the toebox where it's the widest (left) and at the big toe (right)

In the lab, we measure the width of the toebox where it’s the widest (around the ball of the foot) and at the big toe. We do this because having both numbers tells us how much the toebox tapers (how pointy it is). 

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We all have differently shaped toes which is why it’s great to know whether the toebox is more Altra-like (footshaped, almost square-ish), or pointy. 

Author
Jovana Subic
Jovana Subic
Whether it's a vertical kilometre or an ultra, climbing in the Alps or exploring local mountains, Jovana uses every opportunity to trade walls and concrete for forests and trails. She logs at least 10h/week on trails, with no off-season, and 4x more on research on running and running shoes. With a background in physics and engineering management, she prefers her running spiced with data.