All rings are made-to-order in Japanese sizes.
Please refer to the size guide for regional size conversions.
JP | DI (mm) |
CC (mm) |
US | UK | FR |
JP 1 | 13.0 | 40.8 | 1 | C | 41 |
JP 2 | 13.4 | 41.9 | 2 | D | 42 |
JP 3 | 13.7 | 42.9 | 2.5 | E | 43 |
JP 4 | 14.0 | 44.0 | 3 | F | 44 |
JP 5 | 14.4 | 45.0 | 3.5 | G | 45 |
JP 6 | 14.7 | 46.1 | 3.5-4 | G-H | 46 |
JP 7 | 15.0 | 47.1 | 4-4.5 | H-I | 47 |
JP 8 | 15.4 | 48.2 | 4.5-5 | I-J | 48 |
JP 9 | 15.7 | 49.2 | 5 | J | 49 |
JP 10 | 16.0 | 50.3 | 5.5 | K | 50 |
JP 11 | 16.4 | 51.3 | 6 | L | 51 |
JP 12 | 16.7 | 52.4 | 6.5 | L-M | 52 |
JP 13 | 17.0 | 53.4 | 6.5-7 | M-N | 53 |
JP 14 | 17.4 | 54.5 | 7-7.5 | N-O | 54 |
JP 15 | 17.7 | 55.5 | 7.5-8 | O-P | 55 |
JP 16 | 18.0 | 56.6 | 8 | P | 56 |
JP 17 | 18.4 | 57.6 | 8.5 | Q | 57 |
JP 18 | 18.7 | 58.6 | 9 | R | 58 |
JP 19 | 19.0 | 59.7 | 9.5 | S | 59 |
JP 20 | 19.4 | 60.7 | 10 | T | 60 |
JP 21 | 19.7 | 61.8 | 10-10.5 | T-U | 61 |
JP 22 | 20.0 | 62.8 | 10.5 | U | 62 |
JP 23 | 20.4 | 63.9 | 11 | V | 63 |
JP 24 | 20.7 | 64.9 | 11.5 | W | 64 |
JP 25 | 21.0 | 66.0 | 12 | X | 65 |
JP 26 | 21.4 | 67.0 | Y | 66 | |
JP 27 | 21.7 | 68.0 | 13 | Z | 67 |
JP 28 | 22.0 | 69.0 | 13.5 | 68 |