Motorcycle Helmet Sizing Guide
Welcome to MotoHorse, the premier destination for helmet sizing charts! Whether you’re a motorcycle aficionado, a dirtbike enthusiast, a snowmobile adventurer, or a motocross daredevil, we’re here to assist you in finding the ideal helmet fit. Safety is paramount, and our comprehensive collection of sizing charts ensures that you can make an informed choice to protect yourself while enjoying the thrill of the ride.
AFX Adult Helmet Size Chart
| Hat Size | Inches | Centimeters | |
| 2XS* | 6 3/8 – 6 1/2 | 20 1/8” – 20 1/2” | 51 – 52 |
| XS* | 6 2/3 – 6 3/4 | 21 7/8” – 21 1/4” | 53 – 54 |
| S | 6 7/8 – 7 | 21 5/8” – 22” | 55 – 56 |
| M | 7 1/8 – 7 1/4 | 22 3/8” – 22 3/4” | 57 – 58 |
| L | 7 3/8 – 7 1/2 | 23 1/8” – 23 1/2” | 59 – 60 |
| XL | 7 5/8 – 7 3/4 | 24” – 24 3/8” | 61 – 62 |
| 2XL | 7 7/8 – 8 | 24 3/4” – 25 1/8” | 63 – 64 |
| 3XL | 8 3/8 – 8 1/2 | 25 5/8” – 26” | 65 – 66 |
| 4XL | 8 5/8 – 8 3/4 | 26 3/8” – 26 3/4” | 67 – 68 |
AFX Youth Helmet Size Chart
| Hat Size | Inches | Centimeters | |
| S | 6 – 6 1/8 | 19” – 19 3/8” | 48 – 49 |
| M | 6 1/4 – 6 3/8 | 19 3/4” – 20 1/8” | 50 – 51 |
| L | 6 1/2 – 6 2/3 | 20 1/2” – 20 7/8” | 52 – 53 |
*** CAUTION: Parents/Guardians are responsible for assessing whether a Youth Rider can safely and comfortably wear an Adult-sized helmet due to the resemblances in size and fit between Youth Medium and Youth Large, and Adult XX-Small and X-Small helmets as mentioned above. It is crucial to avoid situations where a Youth Rider wears a helmet that is excessively large or heavy, as this could lead to discomfort or safety issues.
K1 / K3 SV / K5 S / Coursa
| Centimeters | |
| XS | 53 – 54 |
| S | 55 – 56 |
| MS | 57 |
| ML | 58 |
| L | 59 – 60 |
| XL | 61 – 62 |
| 2XL | 63 – 64 |
| Inches | Centimeters | |
| XS | 20.8” – 21.2” | 53 – 54 |
| S | 21.6” – 22” | 55 – 56 |
| M | 22.4” – 22.8” | 57 – 58 |
| L | 23.2” – 23.6” | 59 – 60 |
| XL | 24” – 24.4” | 61 – 62 |
Corsair-X — Interior Lining Thickness
| HCM (cm) | Lining Code | 12 mm | 10 mm | 7 mm | 5 mm | |
| XS | 53 – 54 | I | ⭘ | ⬤ | ||
| S | 55 – 56 | II | ⭘ | ⬤ | ⭘ | |
| M | 57 – 58 | III | ⭘ | ⬤ | ⭘ | ⭘ |
| L | 59 – 60 | III | ⭘ | ⭘ | ⬤ | ⭘ |
| XL | 61 – 62 | IV | ⭘ | ⬤ | ⭘ | |
| 2XL | 63 – 64 | V | ⭘ | ⬤ |
Note: Standard ⬤ | Optional ⭘
Corsair-X — Cheek Pad Thickness
| Thicker (mm) | Standard (mm) | Thinner (mm) | |
| XS | 30 | 25 | 20 |
| S | 30 | 25 | 20 |
| M | 30 | 25 | 20 |
| L | 25 | 20 | 15 |
| XL | 25 | 20 | 15 |
| 2XL | 20 | 15 | – |
| Hat Size | Inches | Centimeters | |
| 2XS | 6 3/8 – 6 1/2 | 20 1/8 – 20 1/2 | 51 – 52 |
| XS | 6 5/8 – 6 3/4 | 20 7/8 – 21 1/4 | 53 – 54 |
| S | 6 7/8 – 7 | 21 5/8 – 22 | 55 – 56 |
| M | 7 1/8 – 7 1/4 | 22 3/8 – 22 3/4 | 57 – 58 |
| L | 7 3/8 – 7 1/2 | 23 1/8 – 23 1/2 | 59 – 60 |
| XL | 7 5/8 – 7 3/4 | 24 – 24 3/8 | 61 – 62 |
| 2XL | 7 7/8 – 8 | 24 3/4 – 25 1/8 | 63 – 64 |
| 3XL | 8 1/8 – 8 1/4 | 25 1/2 – 26 | 65 – 66 |
| Hat Size | Inches | Centimeters | |
| XS | 6 5/8 – 6 3/4 | 20 7/8 – 21 1/4 | 53 – 54 |
| S | 6 7/8 – 7 | 21 5/8 – 22 | 55 – 56 |
| M | 7 1/8 – 7 1/4 | 22 1/2 – 22 3/4 | 57 – 58 |
| L | 7 3/8 – 7 1/2 | 23 1/8 – 23 5/8 | 59 – 60 |
| XL | 7 5/8 – 7 3/4 | 24 – 24 1/2 | 61 – 62 |
| 2XL | 7 7/8 – 8 | 24 3/4 – 25 1/4 | 63 – 64 |
| Centimeters | Inches | |
| S | 55 – 56 | 21 1/2” – 21 7/8” |
| M | 57 – 58 | 22 1/4” – 22 5/8” |
| L | 59 – 60 | 23” – 23 1/2” |
| XL | 61 – 62 | 23 7/8” – 24 1/4” |
| 2XL | 63 – 64 | 24 5/8” – 25” |
Thor Adult Helmet Size Chart
| Inches | Centimeters | |
| XS | 20 7/8” – 21 1/4” | 53 – 54 |
| S | 21 3/8” – 22” | 55 – 56 |
| M | 22 1/8” – 22 7/8” | 57 – 58 |
| L | 23 1/2” – 23 7/8” | 59 – 60 |
| XL | 24” – 24 1/2” | 61 – 62 |
| 2XL | 24 5/8” – 25 1/2” | 63 – 64 |
| 3XL | 25 5/8” – 26” | 65 – 66 |
| 4XL | 26 3/8” – 26 3/4” | 67 – 68 |
Thor Youth Helmet Size Chart
| Inches | Centimeters | |
| S | 18 1/2” – 18 7/8” | 47 – 48 |
| M | 19 1/4” – 19 3/4” | 49 – 50 |
| L | 20” – 20 1/2” | 51 – 52 |
Z1R Adult Helmet Size Chart
| Inches | Centimeters | |
| 2XS | 22 1/8 – 20 1/2 | 51 – 52 |
| XS | 20 7/8 – 21 1/4 | 53 – 54 |
| S | 21 5/8 – 22 | 55 – 56 |
| M | 22 1/2 – 22 3/4 | 57 – 58 |
| L | 23 1/8 – 23 5/8 | 59 – 60 |
| XL | 24 – 24 1/2 | 61 – 62 |
| 2XL | 24 3/4 – 25 1/4 | 62 – 64 |
| 3XL | 25 1/2 – 26 | 64 – 65 |
| 4XL | 26 1/4 – 26 3/4 | 66 – 67 |
Z1R Youth Helmet Size Chart
| Inches | Centimeters | |
| S | 18 1/2 – 18 7/8 | 47 – 48 |
| M | 19 1/4 – 19 3/4 | 49 – 50 |
| L | 20 – 20 1/2 | 51 – 52 |
Z1R Child Helmet Size Chart
| Inches | Centimeters | |
| S/M | 18 7/8 – 19 3/4 | 49 – 50 |
| L/XL | 19 7/8 – 20 1/4 | 50 – 51 |
WARNING: Improper usage of helmets or incorrect helmet sizing can lead to injury or death. Please exercise extreme caution when riding and ensure correct helmet fit. These sizing charts are meant to be used as a guide only. It is important to try on your helmet once you receive it to ensure that it fits properly.