Sizing decoded June 7, 2026 2 min read
What Does 65cm Mean in Helmet Sizing?
Head circumference 65 cm = XL/XXL helmet. 25.6 inches.
Helmet Sizes by cm
| Head (cm) | Inches | Letter |
|---|---|---|
| 52-54 | 20.5-21.3 | XS |
| 54-56 | 21.3-22.0 | S |
| 56-58 | 22.0-22.8 | M |
| 58-60 | 22.8-23.6 | L |
| 60-62 | 23.6-24.4 | XL |
| 62-64 | 24.4-25.2 | XXL |
| 64-66 | 25.2-26.0 | 3XL |
FAQs
What does 65cm mean?
Head circumference. 25.6 inches. XXL helmet.
Why cm not letters?
Precision standard for safety.
65cm in inches?
25.6.
Selling helmets on Shopify?
Tailor Size Guide adds head-circumference cm matching.