Nike Shoe Sizing Guide — Do Nike Shoes Run True to Size?
Based on community reports from 78 runners, here's what you need to know about Nike sizing. We have data on 18 Nike shoe models.
Nike Shoes Sizing Data
| Shoe | Sizing | Compare |
|---|---|---|
| Nike Pegasus 42 | True to size | Compare sizes |
| Nike Pegasus 40 | True to size | Compare sizes |
| Nike Alphafly 3 | True to size | Compare sizes |
| Nike Vaporfly 3 | True to size | Compare sizes |
| Nike Free Run 5.0 | True to size | Compare sizes |
| Nike Air Zoom Structure 25 | True to size | Compare sizes |
| Nike Pegasus 41 | Slightly short | Compare sizes |
| Nike Zoom Fly 6 | Runs long | Compare sizes |
| Nike Air Zoom Structure 26 | No data yet | Compare sizes |
| Nike Alphafly 2 | No data yet | Compare sizes |
| Nike Invincible 3 | No data yet | Compare sizes |
| Nike Invincible 4 | No data yet | Compare sizes |
| Nike Pegasus 39 | No data yet | Compare sizes |
| Nike React Infinity Run 4 | No data yet | Compare sizes |
| Nike Vaporfly 2 | No data yet | Compare sizes |
| Nike Wildhorse 7 | No data yet | Compare sizes |
| Nike Wildhorse 8 | No data yet | Compare sizes |
| Nike Zoom Fly 5 | No data yet | Compare sizes |
Nike Sizing FAQ
Do Nike shoes run true to size?
Most Nike shoes run true to size based on community data. Of the 8 models with reports, 6 run true to size, 1 run long, and 1 run short.
Should I size up in Nike?
Nike Pegasus runs true to size across widths. Most Nike running shoes fit true, but the Vaporfly and Alphafly race shoes can feel snug — size up 0.5 if in doubt.
How accurate is this Nike sizing data?
All sizing data on RunSized is sourced from real runners who've worn both a reference shoe and a Nike shoe. We show confidence tiers — more reports means more reliable data. With 78 Nike-related reports, the data gives you a solid starting point.
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