US Size | Circumference(mm) | Inner ring size(mm) | CN/SG/JP | UK, EU & AU |
4 | 47mm | 15mm | size 7 | none |
4.5 | 48mm | 15.3mm | size 8 | 0.5I |
5 | 49.3mm | 15.7mm | size 9 | 0.5J |
5.5 | 51mm | 16.2mm | size 10 | L |
6 | 51.9mm | 16.5mm | size 11 | 0.5L |
6.5 | 53mm | 17mm | size 13 | N |
7 | 54.4mm | 17.3mm | size 14 | 0.7N |
7.5 | 56mm | 17.7mm | size 15 | P |
8 | 57mm | 18.1mm | size 16 | 0.5P |
8.5 | 58mm | 18.5mm | size 17 | R |
9 | 59.5mm | 18.9mm | size 18 | 0.5R |
9.5 | 61mm | 19.4mm | size 19 | 0.5S |
10 | 62.1mm | 19.8mm | size 20 | 0.5T |
10.5 | 63mm | 20.2mm | size 21 | 0.5U |
11 | 64.6mm | 20.6mm | size 23 | 0.5V |
12 | 67.2mm | 21.4mm | size 24 | Y |