How to Measure for Size:
- Measure length of foot in centimeters from heel to big toe
- If measurement falls between two sizes, Sidi suggests choosing the larger of the two sizes and adjusting fit with insoles
| Size (Sidi) | US Men | US Women | Length (cm) |
| 36 | 3.3 | 4.8 | 22cm |
| 37 | 4.1 | 5.6 | 22.7cm |
| 38 | 4.9 | 6.4 | 23.3cm |
| 39 | 5.7 | 7.2 | 24cm |
| 40 | 6.4 | 7.9 | 24.7cm |
| 41 | 7.1 | 8.6 | 25.3cm |
| 42 | 8 | 9.5 | 26cm |
| 43 | 8.8 | 10.3 | 26.7cm |
| 44 | 9.6 | - | 27.3cm |
| 45 | 10.4 | - | 28cm |
| 46 | 11.2 | 28.7cm | |
| 47 | 11.9 | - | 29.3cm |
| 48 | 12.7 | - | 30cm |
| 49 | 13.5 | - | 30.7cm |
| 50 | 14.3 | - | 31.3 |
Note: All sizing information is provided by the manufacturer and may vary depending on how measurements are acquired for rider shoe size.