Trek / Bontrager Helmet Size Guide
Trek Helmet Size Guide
Measure around your head horizontally across your brow and just above your ears.
| Helmet Size | Fit Range (cm) |
|---|---|
| Toddler | 46–50 |
| Child | 48–52 |
| Youth / XS | 50–55 |
| Small | 51–57 |
| S/M | 51–58 |
| Medium | 54–60 |
| M/L | 55–61 |
| Large | 58–63 |
| X-Large | 60–66 |