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40Race Shoe FinderEst. 2023 · London

Head to head

Nike Zoom Fly 6vs
Saucony Kinvara Pro

Zoom Fly 6

£110

Typical street price · £165 RRP

40mm — on the limit
Kinvara Pro

£99

Typical street price · £190 RRP

■ 42mm — over limit

Choose the Zoom Fly 6 if…

  • Your race is run under World Athletics rules — this one is legal at 40mm and the Kinvara Pro is not.
  • You want the lighter shoe: 248g against 269g, a 21g difference you will feel late in a race.

Choose the Kinvara Pro if…

  • You want the bigger return: 1.8–2.9% economy gain against 1.5–2.6%, and that gap widens the longer you are out there.

What does this
mean for you?

Every figure below is recalculated from your race and your current time. The gap between two shoes is not fixed — it grows with how long you are on your feet.

Over marathon from 3:45:00

Time back
Zoom Fly 6: 49s–124sKinvara Pro: 69s–145s
Cost per second saved
Zoom Fly 6: £0.13Kinvara Pro: £0.10

Ranges, not promises. Both figures are against a standard trainer, and the honest answer for most runners is that the difference between two shoes of this class is smaller than the difference a month of decent training makes.

Every number.

010203040504032
Zoom Fly 6
010203040504234
Kinvara Pro

What you pay

Street price
Zoom Fly 6£110
Kinvara Pro£99■

What the shoe is actually selling for across the shops we read, not its RRP.

RRP
Zoom Fly 6£165
Kinvara Pro£190

List price. Almost nobody pays it for a race shoe.

Cost per race
Zoom Fly 6£12
Kinvara Pro£10■

Street price divided by the races the foam stays fast for.

Cost per second saved
Zoom Fly 6£0.13
Kinvara Pro£0.10■

The whole-life question: what each second of race time costs you.

What it does

Estimated saving
Zoom Fly 649s–124s
Kinvara Pro69s–145s■

Against a standard trainer, over the distance and time set above.

Economy gain
Zoom Fly 61.5–2.6%
Kinvara Pro1.8–2.9%■
Built for
Zoom Fly 6Half · Marathon
Kinvara ProHalf · Marathon
Best use case
Zoom Fly 6The sensible answer for a first marathon. Carbon plate, durable foam, a third of the cost per race of an Alphafly because it lasts more than twice as long.
Kinvara ProA plated long-run trainer rather than a racer. Comfortable, durable, and very good at what it is actually for.

How it is built

Weight
Zoom Fly 6248 g■
Kinvara Pro269 g

Manufacturer figure at men's US 9.

Stack (heel)
Zoom Fly 640 mm
Kinvara Pro42 mm
Stack (forefoot)
Zoom Fly 632 mm
Kinvara Pro34 mm
Drop
Zoom Fly 68 mm
Kinvara Pro8 mm
Foam
Zoom Fly 6ZoomX over SR-02
Kinvara ProPWRRUN PB over PWRRUN
Plate
Zoom Fly 6carbon fibre
Kinvara Procarbon fibre

Rules and fit

Road legal
Zoom Fly 6Yes (40 mm)■
Kinvara ProNo (42 mm)

World Athletics caps road racing shoes at 40 mm of stack.

Fit
Zoom Fly 6standard
Kinvara Prostandard
Stability
Zoom Fly 6stable
Kinvara Prostable

Neither is better in the abstract — it depends on your stride.

Race life
Zoom Fly 6~600 km
Kinvara Pro~600 km

How long the foam stays fast, not how long the shoe survives.

Data confidence
Zoom Fly 6verified
Kinvara Proverified

■ marks the better figure where one is genuinely better. Fit, foam, drop and stability carry no mark — they depend on your foot and your stride, not on which shoe is superior.

In your size.

Where to buy

Your UK size

Best price today — some sizes£109.99at Run North West — £55 under RRP

9 retailer checks failed on the last run, so their prices are missing rather than wrong.

Prices are captured when the site is built and stamped with the time of that check. We never rank a retailer by what it pays us; where a link earns a commission it is marked sponsored and the price you pay is unchanged.

Where to buy

Your UK size

Best price today — some sizes£99at Startfitness — £91 under RRP

9 retailer checks failed on the last run, so their prices are missing rather than wrong.

Prices are captured when the site is built and stamped with the time of that check. We never rank a retailer by what it pays us; where a link earns a commission it is marked sponsored and the price you pay is unchanged.