Sizing Charts

Inside Diameter Inside Circumference US, Canada and Mexico UK, Ireland, Australia, and New Zealand Italy, Spain, Netherlands & Switzerland France Germany
in mm in mm
0.586 14.88 14.88 46.8 4 H 6.75 461/2 15
0.602 15.29 1.89 48 41/2 I 8 473/4 151/4
0.618 15.7 1.94 49.3 5 J1/2 9.25 49 153/4
0.634 16.1 1.99 50.6 51/2 K1/2 10.5 501/4 16
0.65 16.51 2.04 51.9 6 L1/2 11.75 523/4 161/2
0.666 16.92 2.09 53.1 61/2 M1/2 13.25 54 17
0.682 17.32 2.14 54.4 7 N1/2 14.5 551/4 171/4
0.714 18.14 2.24 2.24 8 P1/2 17 573/4 18
0.73 18.54 2.29 58.3 81/2 Q1/2 18.25 581/2 181/2
0.746 18.95 2.34 59.5 9 R1/2 19.5 59 19
0.762 19.35 2.39 60.8 91/2 S1/2 20.75 601/4 191/2
0.778 19.76 2.44 62.1 10 T1/2 22 611/2 20
0.794 20.17 2.49 63.4 101/2 U1/2 23.25 623/4 201/4
0.81 20.57 2.54 64.6 11 V1/2 24.75 64 203/4
0.826 20.98 2.59 65.9 111/2 W1/2 26 651/4 21
0.842 21.39 2.65 67.2 12 X1/2 27.25 671/2 211/4