Use a flexible tape to measure the circumference of the head at the largest point (usually around 25mm above the ears.) Round up if between sizes.
Helmet Size | CM |
|
00 | 51 | |
0 | 52 | |
1 | 53-55 | |
2 | 56-57 | |
3 | 58-59 | |
4 | 60-61 | |
5 | 62-63 | |
6 | 64 | |
Hybrid XL Helmet | ||
7 | 65-66 | |
8 | 67-68 |