True-to-Size Millimeter Sizing Comparison
Adidas Stan Smith vs Reebok Classic Nylon
Detailed size conversion chart, cavity measurements in millimeters, and crowd-sourced fit advice for choosing your perfect size.
Interactive Size Converter
Select what size you wear in the Stan Smith to see your calculated size in the Classic Nylon.
Complete Size Conversion Matrix
Direct millimeter-calibrated mapping comparing all available sizes between both shoes.
| Stan Smith (US) | Internal Cavity | Classic Nylon Equivalent | Match Accuracy | Fit Difference |
|---|---|---|---|---|
| US 4 | 237 mm | US 5 | 73% | +2.3 mm |
| US 4.5 | 241 mm | US 5.5 | 85% | +1.3 mm |
| US 5 | 245 mm | US 6 | 49% | +4.3 mm |
| US 5.5 | 249 mm | US 6 | 97% | +0.3 mm |
| US 6 | 254 mm | US 6.5 | 73% | +2.3 mm |
| US 6.5 | 258 mm | US 7 | 85% | +1.3 mm |
| US 7 | 262 mm | US 7.5 | 49% | +4.3 mm |
| US 7.5 | 266 mm | US 7.5 | 97% | +0.3 mm |
| US 8 | 271 mm | US 8.5 | 85% | +1.3 mm |
| US 8.5 | 275 mm | US 9 | 49% | +4.3 mm |
| US 9 | 279 mm | US 9 | 97% | +0.3 mm |
| US 9.5 | 283 mm | US 10 | 61% | +3.3 mm |
| US 10 | 287 mm | US 10 | 91% | -0.7 mm |
| US 10.5 | 292 mm | US 10.5 | 97% | +0.3 mm |
| US 11 | 296 mm | US 11 | 97% | +0.3 mm |
| US 11.5 | 300 mm | US 12 | 73% | +2.3 mm |
| US 12 | 304 mm | US 12.5 | 73% | +2.3 mm |
| US 12.5 | 309 mm | US 13 | 61% | +3.3 mm |
| US 13 | 313 mm | US 13.5 | 38% | +5.3 mm |
| US 13.5 | 317 mm | US 13.5 | 85% | +1.3 mm |
| US 14 | 321 mm | US 14 | 97% | +0.3 mm |
| US 14.5 | 326 mm | US 15 | 49% | +4.3 mm |
| US 15 | 330 mm | US 15 | 97% | +0.3 mm |
| US 16 | 334 mm | US 16 | 2% | +8.3 mm |
| US 17 | 342 mm | US 16 | 97% | +0.3 mm |
| US 18 | 351 mm | US 17 | 97% | +0.3 mm |
| US 19 | 359 mm | US 17 | 9% | -7.7 mm |
| US 20 | 368 mm | US 17 | 0% | -16.7 mm |
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Frequently Asked Questions
How does the Stan Smith size compare to the Classic Nylon?
Both shoes share a very similar length profile. We recommend ordering your standard size in both. The Stan Smith has an internal fit offset of 0.12mm compared to -0.6mm for the Classic Nylon.
Do these shoes fit wide feet comfortably?
The Stan Smith has a snug/narrow width profile, while the Classic Nylon is snug/narrow.