Size Chart

Inside Circumference (mm)	Inside Diameter (mm)	USA Canada	Japan	Italy, Spain Netherlands Switzerland	UK Australia
44.2	14.1	3	4	4	F½
44.8	14.3	3¼	5	5¼	G
45.5	14.5	3½	---	---	G½
46.1	14.7	---	6	6½	H
46.8	14.9	4	7	---	H½
47.4	15.1	---	---	7¾	I
48.0	15.3	4½	8	---	I½
48.7	15.5	---	---	9	J
49.3	15.7	5	9	---	J½
50.0	15.9	---	---	10	K
50.6	16.1	5½	10	---	K½
51.2	16.3	---	---	11¾	L
51.9	16.5	6	11	12¾	L½
52.5	16.7	---	12	---	M
53.1	16.9	6½	13	14	M½
53.8	17.1	---	---	---	N
54.4	17.3	7	14	15¼	N½
55.1	17.5	---	---	---	O
55.7	17.7	7½	15	16½	O½
56.3	17.9	---	---	---	P
57.0	18.1	8	16	17¾	P½
57.6	18.3	---	---	---	Q
58.3	18.5	8½	17	---	Q½
58.9	18.8	---	---	19	R
59.5	19.0	9	18	---	R½
60.2	19.2	---	---	20¼	S
60.8	19.4	9½	19	---	S½
61.4	19.6	---	---	21½	T
62.1	19.8	10	20	---	T½
62.7	20.0	---	21	---	U
63.4	20.2	10½	22	22¾	U½
64.0	20.4	---	---	---	V
64.6	20.6	11	23	---	V½
65.3	20.8	---	---	25	W
65.9	21.0	11½	24	---	W½
66.6	21.2	---	---	---	X
67.2	21.4	12	25	27½	X½
67.8	21.6	---	---	---	Y
68.5	21.8	12½	26	28¾	Z
69.1	22.0	---	---	---	Z½
69.7	22.2	13	27	---	---
70.4	22.4	---	---	---	Z+1
71.0	22.6	13½	---	---	Z+2