| Shoei Helmet Size Chart by Brockton Cycle
| |||
| Size | Centimeter | Inches | Hat Size |
| XSm | 53-54 | 21 1/4 | 6 5/8 - 6 3/4 |
| Sm | 55-56 | 21 5/8 | 6 7/8 - 7 |
| Md | 57-58 | 22 3/8 | 7 1/8 - 7 1/4 |
| Lg | 59-60 | 23 1/8 | 7 3/8 - 7 1/2 |
| XL | 61-62 | 23 1/2 | 7 5/8 - 7 3/4 |
| XXL | 63-64 | 24 1/4 | 8 |
| XXXL | 65-66 | 24 5/8 | 8 3/4 - 8 1/2 |
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