Discontinued · road · Race day / Tempo · $300
Adidas Adizero Prime X 2 Strung: 50 mm heel stack, 9 mm drop, 305 g — specs from independent lab testing.
Built for race day, tempo, at a target pace of 5:30–7:15 /mi on road.
This model is no longer in production. The closest shoe you can buy today is Adidas Adizero Prime X3 STRUNG.
Adidas tuned this midsole very soft (5/5 on our cushioning scale). The foam is highly resilient — it gives energy back rather than swallowing it, which is what makes the shoe feel eager when you push. At 50 mm of heel stack this sits in max-cushion territory; legs stay fresher on long efforts, but the platform is tall. Combined, the ride reads as snappy at 4/5 responsiveness.
There is no plate here. The midsole does all the work, so the shoe flexes naturally and stays versatile across paces — easier on the feet day to day, but without the snap of a plated shoe when you want to roll.
A tall 9 mm drop tips weight forward off the heel, which usually suits heel strikers and calves that dislike low-drop shoes. The rocker is aggressive: the sole is curved and stiff enough to tip you into the next stride on its own, which saves the calf on long runs but feels strange when you slow right down. The forefoot is stiff, so it rolls rather than bends — a lever, not a slipper. It is a neutral platform with no built-in correction.
The toe-box is narrow and performance-oriented; wide-footed runners should try before buying. It runs small; most runners size up a half. Expect roughly 400 miles from the outsole, about $0.75 per mile at $300.
For the foams and plates Adidas uses across its line, read the Adidas brand guide.
Measured against the 542 currently-available shoes in the catalog. The bar shows where this shoe sits in that range.
Weight
306 g / 10.8 oz
31 g heavier than the catalog median of 275 g
Heel stack
50 mm
14 mm taller than the catalog median of 36 mm
Drop
9 mm
3 mm higher than the catalog median of 6 mm
Price
$300
140 pricier than the catalog median of 160
Responsiveness
4 / 5
Catalog median 3 / 5
Cushioning
5 / 5
Catalog median 4 / 5
Energy return
5 / 5
Catalog median 3 / 5
Durability
~400 mi
Catalog median ~400 mi
Within the Adidas line it is heavier than the brand's median (278 g / 9.8 oz) and sits taller than its median stack (35 mm).
Current shoes with the nearest combination of weight, stack, drop, foam feel and plate.
Adidas Adizero Prime X3 STRUNG
285 g / 10.1 oz · 50 mm · 7 mm drop · — · $300
Adidas Adizero Prime X3 STRUNG: 50 mm heel stack, 7 mm drop, 291 g — specs from independent lab testing.
Asics Superblast 2(2024)
252 g / 8.9 oz · 45 mm · 8 mm drop · — · $200
Race-foam stack in a trainer chassis. Long runs that finish faster than they started.
Asics Superblast 3(2026)
249 g / 8.8 oz · 45 mm · 8 mm drop · — · $220
Max-stack super trainer that can race a half and log easy miles.
Nike Pegasus Premium(2025)
309 g / 10.9 oz · 45 mm · 10 mm drop · Nylon · $210
Air Zoom plate plus ZoomX — the most propulsive Pegasus ever built.