Reebok vs Nike Shoe Size — Which Runs Smaller?
Reebok runs about half a US size large compared to Nike. If you wear Reebok in US 9, start by checking Nike in US 9.5. Both brands use the same foot-length measurement — the difference is in the last shape, not the conversion formula.
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Switching rule for this pair
At the US 9 anchor, the same 262mm foot maps to Nike US 9.5. In plain terms: when moving from Reebok to Nike, go up half a US size.
- Reebok: true to size signal from 60% of buyer-fit data.
- Nike: runs small signal from 55% of buyer-fit data.
- If you know your foot length in millimetres, use the Size Passport above before trusting a label-to-label switch.
Reebok → Nike size chart
| US Men (Reebok) | Reebok → Nike | Foot length |
|---|---|---|
| 7 | 7.5 | 246mm |
| 8 | 8.5 | 254mm |
| 9 | 9.5 | 262mm |
| 10 | 10.5 | 271mm |
| 11 | 11.5 | 279mm |
Fit verdict
- Reebok: True to size (60% of buyers)
- Nike: Runs small (55% of buyers)
Why the sizes differ
Reebok runs ~0.5 size larger than Nike.
Reebok foot length is measured in millimetres, then mapped to US size. The Nike last fits the same foot, but the starting label shifts by about half a US size because of each brand's fit bias — not a different conversion formula.