USA Ring Standard

Inside Diameter(mm) Inside Circumference(mm) USA Standard
14.1 44.2 3
14.5 45.5 3.5
14.9 46.8 4
15.3 48 4.5
15.7 49.3 5
16.1 50.6 5.5
16.5 51.9 6
16.9 53.1 6.5
17.3 54.4 7
17.7 55.7 7.5
18.1 57 8
18.5 58.3 8.5
19 59.5 9
19.4 60.8 9.5
19.8 62.1 10
20.2 63.4 10.5
20.6 64.6 11
21 65.9 11.5
21.4 67.2 12
21.8 68.5 12.5
22.2 69.7 13
22.6 71 13.5
23 72.3 14
23.4 73.5 14.5
23.8 74.8 15