Helmet Size Guide
How to Measure
Wrap a soft tape 1 inch above eyebrows, around the widest part of your skull. Measure in cm.
Motorcycle Helmet Sizing
| Size | CM | Inches |
|---|---|---|
| XS | 53-54 | 20⅞-21¼ |
| S | 55-56 | 21⅝-22 |
| M | 57-58 | 22½-22⅞ |
| L | 59-60 | 23¼-23⅝ |
| XL | 61-62 | 24-24⅜ |
| 2XL | 63-64 | 24¾-25¼ |
Brand Notes
Shoei — Slightly narrow, go up if between. Arai — Slightly roomy, round oval. HJC — True to size. AGV — Runs narrow. Bell — True to size.
Auto Helmet Sizing (SA2025/SA2020)
| Size | Hat Size | CM |
|---|---|---|
| XS | 6⅝-6¾ | 53-54 |
| S | 6⅞-7 | 55-56 |
| M | 7⅛-7¼ | 57-58 |
| L | 7⅜-7½ | 59-60 |
| XL | 7⅝-7¾ | 61-62 |
| 2XL | 7⅞-8 | 63-64 |
A new helmet should feel snug. Breaks in 15-20% over the first few weeks.