Size Chart
| Inside Diameter | Inside Circumference | US & Canada | UK & Aus |
| 15.6 mm | 49.3 mm | 5 | J |
| 16.5 mm | 51.9 mm | 6 | L |
| 17.3 mm | 54.5 mm | 7 | N |
| 18.2 mm | 57 mm | 8 | P |
| 18.9 mm | 59.5 mm | 9 | R |
| 19.8 mm | 62.1 mm | 10 | T |
| 20.7 mm | 64.6 mm | 11 | V |
| Inside Diameter | Inside Circumference | US & Canada | UK & Aus |
| 15.6 mm | 49.3 mm | 5 | J |
| 16.5 mm | 51.9 mm | 6 | L |
| 17.3 mm | 54.5 mm | 7 | N |
| 18.2 mm | 57 mm | 8 | P |
| 18.9 mm | 59.5 mm | 9 | R |
| 19.8 mm | 62.1 mm | 10 | T |
| 20.7 mm | 64.6 mm | 11 | V |
