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Inside Diameter		Inside Circumference		Sizes
MM	Inches	MM	Inches	British & Australian	US & Canada	French & Russian	German	Japanese	Swiss

17.35	0.683	54.51	2.15	O	7	55 1/4	17 1/4	14	15 1/4
17.45	0.687	54.82	2.16	O 1/2	7 1/4	-	-	-	-
17.75	0.699	55.76	2.20	P	7 1/2	56 1/2	17 3/4	15	16 1/2
17.97	0.707	56.45	2.22	P 1/2	7 3/4	-	-	-	-
18.19	0.716	57.15	2.25	Q	8	57 3/4	18	16	17 3/4
18.35	0.722	57.65	2.27	Q 1/2	8 1/4	-	-	-	-
18.53	0.729	58.21	2.29	Q 3/4	8 1/2	-	18 1/2	17	-
18.61	0.733	58.47	2.30	R	8 5/8	59	-	-	19
18.69	0.736	58.72	2.31	R 1/4	8 3/4	-	-	-	-
18.80	0.740	59.06	2.32	R 1/2	8 7/8	-	-	-	-
18.89	0.748	59.34	2.35	R 3/4	9	-	19	18	-
19.10	0.752	60.00	2.36	S	9 1/8	60 1/4	-	-	20 1/4
19.22	0.757	60.38	2.38	S 1/4	9 1/4	-	-	-	-
19.31	0.760	60.66	2.39	S 1/2	9 3/8	-	-	-	-
19.41	0.764	60.98	2.40	S 3/4	9 1/2	-	19 1/2	19	-
19.51	0.768	61.29	2.41	T	9 5/8	61 1/2	-	-	21 1/2
19.62	0.772	61.64	2.43	T 1/4	9 3/4	-	-	-	-
19.84	0.781	62.33	2.45	T 1/2	10	-	20	20	-
20.02	0.788	62.89	2.48	U	10 1/4	62 3/4	-	21	22 3/4
20.20	0.797	63.46	2.50	U 1/2	10 1/2	-	20 1/4	22	-
20.32	0.800	63.84	2.51	V	10 5/8	63	-	-	23 3/4
20.44	0.805	64.21	2.53	V 1/4	10 3/4	-	-	-	-
20.68	0.814	64.97	2.56	V 1/2	11	-	20 3/4	23	-
20.76	0.817	65.22	2.57	W	11 1/8	65	-	-	25
20.85	0.821	65.50	2.58	W 1/4	11 1/4	-	-	-	-
20.94	0.824	65.78	2.59	W 1/2	11 3/8	-	-	-	-
21.08	0.830	66.22	2.61	W 3/4	11 1/2	-	21	24	-
21.18	0.834	66.54	2.62	X	11 5/8	66 1/4	-	-	26 1/4
21.24	0.836	66.73	2.63	X 1/4	11 3/4	-	-	-	-
21.30	0.839	66.92	2.64	X 1/2	11 7/8	-	-	-	-
21.49	0.846	67.51	2.66	Y	12	67 1/2	21 1/4	25	27 1/2
21.69	0.854	68.14	2.68	Y 1/2	12 1/4	-	-	-	-
21.89	0.862	68.77	2.71	Z	12 1/2	68 3/4	21 3/4	26	28 3/4
22.10	0.870	69.43	2.73	Z +1/2	12 3/4	-	-	-	-
22.33	0.879	70.15	2.76	Z+1	13	-	22	27	-
22.60	0.890	71.00	2.80	Z+1.5	13.5	-

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Size guide