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40Race Shoe FinderEst. 2023 · London

Head to head

HOKA Rocket X 3vs
Nike Alphafly 3

Rocket X 3

£140

Typical street price · £220 RRP

39mm — road legal
Alphafly 3

£203

Typical street price · £285 RRP

40mm — on the limit

Choose the Rocket X 3 if…

  • You want the lighter shoe: 200g against 218g, a 18g difference you will feel late in a race.
  • Money matters: it is selling around £140 against £203, and the time difference between them is smaller than the price difference suggests.
  • You are racing 10K — built for it, where the Alphafly 3 is not.

Choose the Alphafly 3 if…

  • You want the bigger return: 3.4–4.6% economy gain against 2.9–4%, and that gap widens the longer you are out there.
  • You would rather buy on measured numbers: this shoe's specs are manufacturer-confirmed, the Rocket X 3's are estimated.

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
Rocket X 3: 145s–219sAlphafly 3: 179s–260s
Cost per second saved
Rocket X 3: £0.17Alphafly 3: £0.23

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.

010203040503934
Rocket X 3
010203040504032
Alphafly 3

What you pay

Street price
Rocket X 3£140■
Alphafly 3£203

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

RRP
Rocket X 3£220
Alphafly 3£285

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

Cost per race
Rocket X 3£32■
Alphafly 3£51

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

Cost per second saved
Rocket X 3£0.17■
Alphafly 3£0.23

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

What it does

Estimated saving
Rocket X 3145s–219s
Alphafly 3179s–260s■

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

Economy gain
Rocket X 32.9–4%
Alphafly 33.4–4.6%■
Built for
Rocket X 310K · Half · Marathon
Alphafly 3Half · Marathon
Best use case
Rocket X 3HOKA’s legal racer, and much the better shoe for anyone who actually needs to comply with the rules. Balanced and predictable.
Alphafly 3Still the reference marathon shoe. The Air pods give a propulsive forefoot that nothing else quite replicates, and the wider platform makes it manageable late in a race when your form has gone.

How it is built

Weight
Rocket X 3200 g■
Alphafly 3218 g

Manufacturer figure at men's US 9.

Stack (heel)
Rocket X 339 mm
Alphafly 340 mm
Stack (forefoot)
Rocket X 334 mm
Alphafly 332 mm
Drop
Rocket X 35 mm
Alphafly 38 mm
Foam
Rocket X 3PEBA
Alphafly 3ZoomX with Air Zoom pods
Plate
Rocket X 3carbon fibre
Alphafly 3carbon fibre

Rules and fit

Road legal
Rocket X 3Yes (39 mm)
Alphafly 3Yes (40 mm)

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

Fit
Rocket X 3standard
Alphafly 3standard
Stability
Rocket X 3balanced
Alphafly 3balanced

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

Race life
Rocket X 3~280 km■
Alphafly 3~250 km

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

Data confidence
Rocket X 3estimated
Alphafly 3verified■

■ 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£140at Interval Running — £80 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£199.99at Run North West — £85 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.