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40Race Shoe FinderEst. 2023 · London

Head to head

HOKA Cielo X1 2.0vs
On Cloudboom Strike

Cielo X1 2.0

£150

Typical street price · £250 RRP

■ 46mm — over limit
Cloudboom Strike

£175

Typical street price · £270 RRP

39mm — road legal

Choose the Cielo X1 2.0 if…

  • You want more shoe underneath you late on: 46mm against 39mm, which is protection over a long race rather than speed over a short one.
  • 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.
  • You want more races out of one pair: about 350km of competitive life against 250km.
  • You are racing Ultra / 50K+ — built for it, where the Cloudboom Strike is not.
  • You would rather buy on measured numbers: this shoe's specs are manufacturer-confirmed, the Cloudboom Strike's are estimated.

Choose the Cloudboom Strike if…

  • Your race is run under World Athletics rules — this one is legal at 39mm and the Cielo X1 2.0 is not.
  • You want the bigger return: 3–4.2% economy gain against 2.8–4%, and that gap widens the longer you are out there.
  • You want the lighter shoe: 195g against 230g, a 35g difference you will feel late in a race.
  • You race off a strong, repeatable stride and want the more aggressive ride rather than the safer one.
  • You have a narrow foot and want to be locked in.
  • You are racing Half marathon — built for it, where the Cielo X1 2.0 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
Cielo X1 2.0: 138s–219sCloudboom Strike: 152s–233s
Cost per second saved
Cielo X1 2.0: £0.15Cloudboom Strike: £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.

010203040504639
Cielo X1 2.0
010203040503933
Cloudboom Strike

What you pay

Street price
Cielo X1 2.0£150■
Cloudboom Strike£175

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

RRP
Cielo X1 2.0£250
Cloudboom Strike£270

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

Cost per race
Cielo X1 2.0£27■
Cloudboom Strike£44

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

Cost per second saved
Cielo X1 2.0£0.15■
Cloudboom Strike£0.23

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

What it does

Estimated saving
Cielo X1 2.0138s–219s
Cloudboom Strike152s–233s■

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

Economy gain
Cielo X1 2.02.8–4%
Cloudboom Strike3–4.2%■
Built for
Cielo X1 2.0Marathon · Ultra
Cloudboom StrikeHalf · Marathon
Best use case
Cielo X1 2.0Enormous, cushioned and surprisingly stable. For heavier runners and slower marathoners it may genuinely be the most comfortable way to cover 42km fast.
Cloudboom StrikeA genuinely competitive marathon racer and the first On shoe that belongs in this conversation on merit.

How it is built

Weight
Cielo X1 2.0230 g
Cloudboom Strike195 g■

Manufacturer figure at men's US 9.

Stack (heel)
Cielo X1 2.046 mm
Cloudboom Strike39 mm
Stack (forefoot)
Cielo X1 2.039 mm
Cloudboom Strike33 mm
Drop
Cielo X1 2.07 mm
Cloudboom Strike6 mm
Foam
Cielo X1 2.0PEBA
Cloudboom StrikeHelion HF
Plate
Cielo X1 2.0carbon fibre
Cloudboom Strikecarbon fibre

Rules and fit

Road legal
Cielo X1 2.0No (46 mm)
Cloudboom StrikeYes (39 mm)■

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

Fit
Cielo X1 2.0standard
Cloudboom Strikenarrow
Stability
Cielo X1 2.0stable
Cloudboom Strikebalanced

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

Race life
Cielo X1 2.0~350 km■
Cloudboom Strike~250 km

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

Data confidence
Cielo X1 2.0verified■
Cloudboom Strikeestimated

■ 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£150at Armaghsports — £100 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£175at Fitstuff — £95 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.