Size Guide

Circumference (mm)	Diameter(mm)	US	UK & Australia	Germany & France	Spain  & Italy	Japan  & China
46.8 mm	15 mm	4	H	46.8	6.5	7
48 mm	15.3 mm	4.5	I	48	8	8
49.3 mm	15.6 mm	5	J	49.3	9.5	9
50.6 mm	16.2 mm	5.5	K	50.6	10.5	10
51.9 mm	16.6 mm	6	L	51.9	12	11
53.1 mm	16.9 mm	6.5	M	53.1	13.5	13
54.4 mm	17.2 mm	7	N	54.4	14.5	14
55.7 mm	17.8 mm	7.5	O	55.7	16	15
57.0 mm	18.1 mm	8	P	57	17	16
58.3 mm	18.5 mm	8.5	Q	58.3	18.5	17
59.5 mm	19.1 mm	9	R	59.5	20	18
60.8 mm	19.4 mm	9.5	S	60.8	21	19
62.1 mm	19.7 mm	10	T	62.1	22.5	20
63.4 mm	20.4 mm	10.5	U	63.4	23.5	22
64.6 mm	20.7 mm	11	V	64.6	25	23
65.9 mm	21.0 mm	11.5	W	65.9	26	24
67.2 mm	21.6 mm	12	X	67.2	27.5	25

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