| Adult Road / Urban / MTB Helmets* | CM | IN |
| Small | 52-56 | 20 1/2-22 |
| Small/Medium | 50-56 | 19 2/3-22 |
| Medium | 55-59 | 21 2/3-23 2/9 |
| Medium/Large | 55-61 | 21 2/3-24 |
| Large | 58-61 | 22 5/6-24 |
| X Large | 61-64 | 24-25 1/5 |
| Unisize | 54-61 | 21 1/4-24 |
To determine correct size measure head circumference
2.5cm above eyebrows.
Note: Head circumference measurements falling between two sizes should consider ordering the smaller size helmet.
Helmet should sit level on the head at eyebrow level. Straps should fit close on the cheek and behind the ear. Buckle should allow opening of mouth while not being too loose.
* Does not include Full Face MTB models