Arai Helmets Sizing Information
How to sizeHELMET SIZE | CORSAIR V | RX-Q | VECTOR-2 | SIGNET Q | VX-PRO 3 | XD4 |
OPTIONAL | 40MM | - | - | 40MM | 35MM | 35MM |
OPTIONAL | 35MM | 35MM | - | 35MM | - | - |
X-SMALL (STANDARD) | 30MM | 30MM | 30MM | 30MM | 25MM | 25MM |
SMALL (STANDARD) | 30MM | 30MM | 30MM | 30MM | 25MM | 25MM |
MEDIUM (STANDARD) | 30MM | 30MM | 30MM | 30MM | 25MM | 25MM |
LARGE (STANDARD) | 25MM | 25MM | 25MM | 25MM | 20MM | 20MM |
X-LARGE (STANDARD) | 25MM | 25MM | 25MM | 25MM | 20MM | 20MM |
XX-LARGE (STANDARD) | 25MM | 25MM | 25MM | 20MM | 20MM | 20MM |
OPTIONAL | 15MM | - | - | 15MM | 12MM | 12MM |
OPTIONAL | 12MM | - | - | 12MM | - | - |
SHELL INTERIOR SHAPE* | I/O | I/O | I/O | L/O | I/O | I/O |
HELMET SIZE | LINING CODE | 12MM THICKNESS | 10MM THICKNESS | 7MM THICKNESS | 5MM THICKNESS |
X-SMALL | II (SM) | OPTIONAL | OPTIONAL | STANDARD | OPTIONAL |
SMALL | II (SM) | OPTIONAL | OPTIONAL | STANDARD | OPTIONAL |
MEDIUM | III (MD) | OPTIONAL | STANDARD | OPTIONAL | OPTIONAL |
LARGE | III (MD) | OPTIONAL | OPTIONAL | STANDARD | OPTIONAL |
X-LARGE | IV (LG) | OPTIONAL | OPTIONAL | STANDARD | OPTIONAL |
XX-LARGE | IV (LG) | OPTIONAL | OPTIONAL | OPTIONAL | STANDARD |
SIZE | INCHES | CM | HAT SIZE |
X-SMALL | 20 7/8 - 21 1/4 | 53-54 | 6 5/8 - 6 3/4 |
SMALL | 21 5/8 - 22 | 55-56 | 6 7/8 - 7 |
MEDIUM | 22 3/8 - 22 3/4 | 57-58 | 7 1/8 - 7 1/4 |
LARGE | 23 1/8 - 23 1/2 | 59-60 | 7 3/8 - 7 1/2 |
X-LARGE | 24 - 24 3/8 | 61-62 | 7 5/8 - 7 3/4 |
XX-LARGE | 24 3/4 - 25 1/8 | 63-64 | 7 7/8 - 8 |