Size Guide

Circumference* = Internal circumference in millimeters

Diameter** = Internal diameter in millimeters

CIRCUMFERENCE* DIAMETER** EUROPEAN USA BRITISH
48 15.30 8 4 ¾ I ½
49 15.60 9 5 J
50 15.90 10 5 ¼ K
51 16.23 11 5 ½ K ½
52 16.55 12 6 L ½
53 16.87 13 6 ¼ M
54 17.19 14 6 ¾ -7 N
55 17.56 15 7 ¼ O
56 17.83 16 7 ½ O ½
57 18.14 17 7 ¾ – 8 P ½
58 18.46 18 8 ¼ Q
59 18.78 19 8 ¾ R
60 19.10 20 9 S
61 19.42 21 9 ½ S ½
62 19.74 22 9 ¾-10 T ½
63 20.05 23 10 ¼ U
64 20.37 24 10 ½ V
65 20.69 25 11 W
66 21.01 26 11 ¼ W ½
67 21.33 27 11 ¾ X ½
68 21.65 28 12 Y
69 21.96 29 12 ½ Z
70 22.28 30 12 ¾ Z+1
71 22.70 31.50 13 ½ Z +2
72 23.10 32.60 14 Z+3
73 23.25 33 14 ¼ Z+3+ ½
74 23.50 34 14 ½ Z+4