ShoesInov-8Roadfly

Inov-8

Inov-8 Roadfly

Inov 8 Roadfly. 31.5mm stack, 251g. Retailer specs verified on Running Warehouse.

PR Run Verified
Soft trailsLong ultrasDaily training

PR Run scores

Grip3/5
Cushion4/5
Protection2/5
Durability3/5
Versatility3/5

PR Run derived fit scores

69Great

100-miler readiness

Will this shoe survive a hundred-mile night? 31.5 mm stack, cushion 4/5

42Passable

Descent tolerance

Does it save your toenails on long descents? 22.1 mm forefoot stack

61Solid

Swelling room

Room to grow when your feet swell? 31.5 mm heel stack

97Elite

Grit resistance

Does dust stay outside the shoe? 5 BR breathability

24Weak

Hot-day comfort

How well does it breathe in heat? 5 BR / ?% drying

63Solid

Achilles-friendly

Kind to a cranky achilles? 9.4 mm drop, heel counter 2/5

Full specs

Drop

9.4 mm

Heel stack

31.5 mm

Forefoot stack

22.1 mm

Weight

251 g

Plate

No

Waterproof

No

Lab measurements

MeasurementValue
Breathability5 BR
Heel counter2/5
Outsole thickness3.8 mm
Tongue padding8.5 mm
Insole removableYes
Insole thickness7.2 mm
Reflective elementsYes

Lab numbers from RunRepeat. Sources.

Fit intelligence

Runs small. Consider a half size up.

Fit numbers from the lab. Swell guidance: foot care.

Questions before you race

Is the Inov-8 Roadfly good for 100-mile races?

Great. 31.5 mm stack, cushion 4/5. 100-miler readiness score 69/100.

Does the Inov-8 Roadfly fit wide feet?

Toebox width has not been measured in the lab yet.

What is the drop on the Inov-8 Roadfly?

9.4 mm, with a 31.5 mm heel stack and 22.1 mm forefoot.

Is the Inov-8 Roadfly good on wet rock?

Lab traction has not been measured for this model yet.

Manufacturer specs

New lab data on soft trails shoes, once a month.

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Image: Inov-8 product photo

Specs: retailer. Verified Sep 2, 2026.

Report inaccurate data: hi@pr.run. Data sources.

Inov-8 Roadfly Review, Specs, and Fit (2026) | PR Run