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Main page » Hardware » Replacement Parts » SIDI Lower Ankle Support for SIDI Rex & Rex Air - Black, Black
SIDI Lower Ankle Support for SIDI Rex & Rex Air - Black, Black
(Product No.: MC-1699-279-314-003)
SIDI Size Chart
Fit-und-Warm carries SIDI mainly for cycling and motorcycle footwear and spare parts, plus selected apparel/sock areas. The central chart is therefore SIDI footwear sizing.
SIDI Regular Fit Shoes
| EU | US | UK | Foot length / CM reference |
|---|---|---|---|
| 36 | 4 | 3 | 22 |
| 37 | 5 | 4 | 22.7 |
| 38 | 6 | 5 | 23.3 |
| 38.5 | 6.5 | 5.5 | 23.7 |
| 39 | 6.5 | 5.5 | 24 |
| 39.5 | 7 | 6 | 24.4 |
| 40 | 7.5 | 6.5 | 24.7 |
| 40.5 | 8 | 7 | 25 |
| 41 | 8 | 7 | 25.3 |
| 41.5 | 8.5 | 7.5 | 25.7 |
| 42 | 9 | 8 | 26 |
| 42.5 | 9.5 | 8.5 | 26.4 |
| 43 | 10 | 9 | 26.7 |
| 43.5 | 10.5 | 9.5 | 27 |
| 44 | 10.5 | 9.5 | 27.3 |
| 44.5 | 11 | 10 | 27.7 |
| 45 | 11.5 | 10.5 | 28 |
| 45.5 | 12 | 11 | 28.4 |
| 46 | 12 | 11 | 28.7 |
| 46.5 | 12.5 | 11.5 | 29 |
| 47 | 13 | 12 | 29.3 |
| 48 | 13.5 | 12.5 | 30 |
| 49 | 14.5 | 13.5 | 30.7 |
| 50 | 15 | 14 | 31.3 |
| 51 | 16 | 15 | 32 |
| 52 | 17 | 16 | 32.7 |
SIDI uses different lasts depending on shoe family. For Millennium Fit or special women's/Wide/Mega models, use the product-specific SIDI chart. The Regular Fit chart above must not be transferred to every special fit without checking.
Apparel and Socks
SIDI apparel and socks use sizes by product family. Because no single current brand master chart has been confirmed for all FuW textile products, the specific product sizing applies.
Assortment check: Fit-und-Warm SIDI brand page. Manufacturer source: official SIDI Fit/Size Guide data for Regular Fit and Millennium Fit. Research checked on 20 August 2026.