ASICS GT-2170 fits in the same number as Air Jordan 1, Air Max 90, Nike Dunk Low, Air Max 97, and ASICS GEL-Kayano 18 — but about half a size smaller in number than Air Force 1 and adidas Superstar. At offset +0.351, GT-2170 sits in the AJ1/AM90 cluster alongside AM97 (+0.355), GEL-Kayano 18 (+0.357), Nike Vapormax Plus (+0.343), and adidas YEEZY Boost 350 V2 (+0.476). Based on 119 owner-reported pairs in the Feetlot database: if your reference is AJ1 or AM90, order the same size. If your reference is AF1 or Superstar, size up half.
ASICS GT-2170 Sizing — What 119 Pairs in the Feetlot Database Tell Us
The ASICS GT-2170 is among the most-tracked ASICS running models in the Feetlot database. Across 119 owner-reported pairs, the residual variance is tight (standard deviation ≈ 0.25 size units). At offset +0.351, GT-2170 rounds to "same" as AJ1 (+0.217), AM90 (+0.314), Dunk Low (+0.275), AM97 (+0.355), Nike Vapormax Plus (+0.343), Nike Zoom Fly 3 (+0.344), ASICS GEL-Kayano 18 (+0.357), and adidas YEEZY Boost 350 V2 (+0.476) at 0.5 increments. AF1 (0.000) rounds to half a size smaller in number; adidas Superstar (−0.065) also rounds to half a size smaller.
Like the GEL-Kayano 18, the GT-2170's structured cushioned midsole places it in the AJ1/AM90 cluster rather than the AF1/Superstar baseline. ASICS running shoes in the Feetlot database consistently sit in the AJ1-level cluster — a half step above the AF1/Superstar group.
Should You Size Up in ASICS GT-2170?
Coming from AF1, adidas Superstar, or Stan Smith
Size up half. AF1, Superstar, and Stan Smith run about half a size smaller in number than GT-2170. If you wear AF1 in 10 or Superstar in 10, take GT-2170 in 10.5.
Coming from AJ1, AM90, Dunk Low, or ASICS GEL-Kayano 18
Same size. AJ1, AM90, Dunk Low, and GEL-Kayano 18 all round to the same size as GT-2170 in 0.5 increments. No adjustment needed.
Coming from YEEZY Boost 350 V2 or Nike Vapormax Plus
Same size. YEEZY 350 V2 (+0.476) and Vapormax Plus (+0.343) both round to the same size as GT-2170. Same number in all three.
Wide feet
ASICS GT-2170 is available in standard (D) and wide (2E) widths for men. Order the correct length in the appropriate width.
How ASICS GT-2170 Compares to Other Sneakers
The ASICS GT-2170 fits at the same numerical size as Air Jordan 1, Air Jordan 4, Nike Air Max 90, Air Max 97, Nike Dunk Low, Nike Dunk High, Nike Air Vapormax Plus, Nike Zoom Fly 3, adidas Ultraboost 19, ASICS GEL-Kayano 18, and adidas YEEZY Boost 350 V2. According to Feetlot data, all of these round to the same size in 0.5 increments.
The shoes that run smaller in number than GT-2170 — size up half: Nike Air Force 1, adidas Superstar, adidas Stan Smith, adidas NMD R1, Vans Old Skool, New Balance 574, and New Balance 530. If you wear AF1 or Superstar in 10, take GT-2170 in 10.5.
Sign in to Feetlot and add a few of your other sneakers to get a personal GT-2170 size recommendation.
ASICS GT-2170 Size Chart (US / EU / UK)
| US Men's | US Women's | UK | EU |
|---|---|---|---|
| 6 | 7.5 | 5.5 | 39 |
| 6.5 | 8 | 6 | 39.5 |
| 7 | 8.5 | 6.5 | 40.5 |
| 7.5 | 9 | 7 | 41 |
| 8 | 9.5 | 7.5 | 41.5 |
| 8.5 | 10 | 8 | 42 |
| 9 | 10.5 | 8.5 | 42.5 |
| 9.5 | 11 | 9 | 43.5 |
| 10 | 11.5 | 9.5 | 44 |
| 10.5 | 12 | 10 | 44.5 |
| 11 | 12.5 | 10.5 | 45 |
| 11.5 | 13 | 11 | 46 |
| 12 | 13.5 | 11.5 | 46.5 |
| 13 | 14.5 | 12.5 | 47.5 |
Common Sizing Mistakes
- Ordering GT-2170 in your AF1 or Superstar size. Both run about half a size smaller in number. If you wear AF1 or Superstar in 10, take GT-2170 in 10.5.
- Assuming GT-2170 fits differently than GEL-Kayano 18. Both ASICS models round to the same size in the Feetlot model. Same number in both.
- Assuming GT-2170 fits differently than AJ1 or AM90. All three round to the same size in 0.5 increments. Same number in all.
How Feetlot Computes These Numbers
Every ASICS GT-2170 sizing recommendation on Feetlot is the output of a global offset model fit to over 100,000 owner-reported shoe records. Each shoe gets a single number — its "size offset" — that captures how its sizing drifts relative to a reference shoe (the Nike Air Force 1). The result: sizing advice that holds up no matter how unusual a wardrobe is.