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40Race Shoe FinderEst. 2023 · London

adidas Prime X 3 Strung

■ +10.0mm overstandard fit2025

£149

Typical street price · £250 RRP

010203040505044
Midsole to scale · mm · red dashes mark the 40mm road limit

Typical of 18 listings at 3 shops we read.

Weight
275 g (men's US 9)
Stack
50 mm heel / 44 mm fore
Drop
6 mm
Plate
carbon fibre
Foam
Lightstrike Pro
Stability
balanced
Competitive life
~500 km
Built for
Marathon · Ultra

Verdict

Deliberately built past the rules. Enormous stack, huge cushioning, and superb for long training runs or any race that does not apply World Athletics regulations.

■ Caution

At 50mm this is 10mm over the road limit. Not legal for any World Athletics Applicable Competition. Fine for most local races and all training.

Where to buy

Your UK size

Best price today — some sizes£145at Runningbear — £105 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.

Legality by event

Road racing
■ +10.0mm over
Track events
■ +30.0mm over
Field events
■ +30.0mm over
Cross country (spiked shoes)
■ +30.0mm over
Cross country (non-spiked)
■ +10.0mm over
Race walking
■ +10.0mm over
Mountain and trail
no limit

Limits bind World Athletics Applicable Competitions; most club and local races apply no shoe rule at all. What that means in practice.

Reading — what would the Prime X 3 Strung save you?

Saving
−2:32 … −3:53
Projected
3:41:07
Per race
£19
~7.9 races in the foam
Per second
£0.10
whole-life basis

Economy gain 3–4.2% v. a traditional flat, adjusted for pace and your current shoes. Full method.

Manufacturer-stated specs unless marked estimated · last reviewed 2026-08-13 · prices are UK RRP; check the retailer for the live figure.

£149Street priceWhere to buy ↓