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	46^1/2	15
0.602	15.29	1.89	48	4^1/2	I	8	47^3/4	15^1/4
0.618	15.7	1.94	49.3	5	J^1/2	9.25	49	15^3/4
0.634	16.1	1.99	50.6	5^1/2	K^1/2	10.5	50^1/4	16
0.65	16.51	2.04	51.9	6	L^1/2	11.75	52^3/4	16^1/2
0.666	16.92	2.09	53.1	6^1/2	M^1/2	13.25	54	17
0.682	17.32	2.14	54.4	7	N^1/2	14.5	55^1/4	17^1/4
0.714	18.14	2.24	2.24	8	P^1/2	17	57^3/4	18
0.73	18.54	2.29	58.3	8^1/2	Q^1/2	18.25	58^1/2	18^1/2
0.746	18.95	2.34	59.5	9	R^1/2	19.5	59	19
0.762	19.35	2.39	60.8	9^1/2	S^1/2	20.75	60^1/4	19^1/2
0.778	19.76	2.44	62.1	10	T^1/2	22	61^1/2	20
0.794	20.17	2.49	63.4	10^1/2	U^1/2	23.25	62^3/4	20^1/4
0.81	20.57	2.54	64.6	11	V^1/2	24.75	64	20^3/4
0.826	20.98	2.59	65.9	11^1/2	W^1/2	26	65^1/4	21
0.842	21.39	2.65	67.2	12	X^1/2	27.25	67^1/2	21^1/4