Short answer: No single Nike rule. Air Force 1 often runs long; many Dunks and Jordan 1s sit nearer true to size; performance Pegasus is usually TTS with width options.
| Model | Verdict | Width | Advice |
|---|---|---|---|
| Nike Air Force 1 '07 | Runs Big Verified | Roomy boxy toebox | Size down half a size (TTS if wide feet) |
| Nike Dunk Low | True to Size Verified | More tapered than AF1 — can feel snug in toebox | True to size; half up if wide |
| Nike Pegasus 41 | True to Size Verified | Standard running last; wide options on some SKUs | True to size; use Wide/Extra Wide rather than length-up |
| Nike Vomero 5 | True to Size Verified | Lifestyle mesh — more forgiving than flat court shoes | True to size |
| Jordan Air Jordan 1 High | True to Size Verified | Basketball-heritage toebox — roomier than Dunk; narrow feet may half down, wide may half up | True to size (same as usual Nike/Jordan size) |
| Nike Air Max 90 | True to Size Verified | Can feel snug across mudguard panels for wide feet | True to size; half up if wide feet |
| Nike Blazer Mid '77 | Runs Narrow Verified | Structured midfoot/toebox narrower than AF1 — lab width below average | True to size length; half up if wide |
| Nike Air Max 1 | True to Size Verified | Slimmer/narrower than AF1 and many AM90s — width is the main caveat | True to size; wide feet often go half up for the narrow toe box |
| Nike Cortez | Runs Small Verified | Heritage narrow last; toe box is snug and does not stretch much | Size up half a size — especially if average-to-wide feet |
| Jordan Air Jordan 4 Retro | True to Size Partial | Narrower at the metatarsals on classic retros; Reimagined/SB more accommodating | True to size; half up if wide (esp. pre-2023 retros) |