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40Race Shoe FinderEst. 2023 · London

Head to head

New Balance FuelCell SuperComp Trainer v4vs
Nike Zoom Fly 6

FuelCell SuperComp Trainer v4

£157

Typical street price · £190 RRP

■ 47mm — over limit
Zoom Fly 6

£110

Typical street price · £165 RRP

40mm — on the limit

Choose the FuelCell SuperComp Trainer v4 if…

  • You want the bigger return: 2.4–3.5% economy gain against 1.5–2.6%, and that gap widens the longer you are out there.
  • You want more shoe underneath you late on: 47mm against 40mm, which is protection over a long race rather than speed over a short one.
  • You race off a strong, repeatable stride and want the more aggressive ride rather than the safer one.
  • You have a broad foot, or your toes spread as a long race goes on.
  • You want more races out of one pair: about 650km of competitive life against 600km.
  • You are racing Ultra / 50K+ — built for it, where the Zoom Fly 6 is not.

Choose the Zoom Fly 6 if…

  • Your race is run under World Athletics rules — this one is legal at 40mm and the FuelCell SuperComp Trainer v4 is not.
  • You want the lighter shoe: 248g against 269g, a 21g difference you will feel late in a race.
  • You want something more forgiving. This is the steadier platform — useful if your form goes late, or if you are on your feet longer.
  • You want a conventional fit rather than a narrow or wide last.
  • Money matters: it is selling around £110 against £157, and the time difference between them is smaller than the price difference suggests.
  • You are racing Half marathon — built for it, where the FuelCell SuperComp Trainer v4 is not.

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
FuelCell SuperComp Trainer v4: 111s–186sZoom Fly 6: 49s–124s
Cost per second saved
FuelCell SuperComp Trainer v4: £0.10Zoom Fly 6: £0.13

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.

010203040504741
FuelCell SuperComp Trainer v4
010203040504032
Zoom Fly 6

What you pay

Street price
FuelCell SuperComp Trainer v4£157
Zoom Fly 6£110■

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

RRP
FuelCell SuperComp Trainer v4£190
Zoom Fly 6£165

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

Cost per race
FuelCell SuperComp Trainer v4£15
Zoom Fly 6£12■

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

Cost per second saved
FuelCell SuperComp Trainer v4£0.10■
Zoom Fly 6£0.13

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

What it does

Estimated saving
FuelCell SuperComp Trainer v4111s–186s■
Zoom Fly 649s–124s

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

Economy gain
FuelCell SuperComp Trainer v42.4–3.5%■
Zoom Fly 61.5–2.6%
Built for
FuelCell SuperComp Trainer v4Marathon · Ultra
Zoom Fly 6Half · Marathon
Best use case
FuelCell SuperComp Trainer v4A max-stack plated trainer that makes easy miles feel effortless. Beloved for long runs.
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.

How it is built

Weight
FuelCell SuperComp Trainer v4269 g
Zoom Fly 6248 g■

Manufacturer figure at men's US 9.

Stack (heel)
FuelCell SuperComp Trainer v447 mm
Zoom Fly 640 mm
Stack (forefoot)
FuelCell SuperComp Trainer v441 mm
Zoom Fly 632 mm
Drop
FuelCell SuperComp Trainer v46 mm
Zoom Fly 68 mm
Foam
FuelCell SuperComp Trainer v4PEBA FuelCell
Zoom Fly 6ZoomX over SR-02
Plate
FuelCell SuperComp Trainer v4carbon fibre
Zoom Fly 6carbon fibre

Rules and fit

Road legal
FuelCell SuperComp Trainer v4No (47 mm)
Zoom Fly 6Yes (40 mm)■

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

Fit
FuelCell SuperComp Trainer v4wide
Zoom Fly 6standard
Stability
FuelCell SuperComp Trainer v4balanced
Zoom Fly 6stable

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

Race life
FuelCell SuperComp Trainer v4~650 km■
Zoom Fly 6~600 km

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

Data confidence
FuelCell SuperComp Trainer v4verified
Zoom Fly 6verified

■ 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£157at Amphibianking — £33 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£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.