SIZE GUIDE

Sirciam rings are available in most of the sizes listed below.

We do offer quarter sizes by special request :)

Use the ‘add order note’ button (found in the shopping cart area) to let us know of the desired size.

INTERNAL DIAMETER	USA CANADA	UK	EUROPE	JAPAN
13.7 mm	2.5	E	42 3/4	3
14.1 mm	3	F	44	4
14.5 mm	3.5	G	45 /14	5
14.8 mm	4	H 1/2	46 1/2	7
15.2 mm	4.5	I 1/2	47 3/4	8
15.7mm	5	J 1/2	50	9
16.1mm	5.5	L	51 3/4	10 1/2
16.5mm	6	M	52 3/4	11 1/2
16.9 mm	6.5	N	54	13
17.3 mm	7	O	55 1/4	14
17.7 mm	7.5	P	56 1/2	15
18.2 mm	8	Q	57 3/4	16
18.5 mm	8.5	Q 1/2	58 1/2	17
18.9 mm	9	R 1/2	60	18
19.4 mm	9.5	S 1/2	61 1/2	19
19.8 mm	10	T 1/2	62 1/4	20
20.2 mm	10.5	U 1/2	63	22
20.7 mm	11	V 1/2	64 1/2	23
21.1 mm	11.5	W 1/2	66 1/4	24
21.5 mm	12	Y	67 1/2	25
21.9 mm	12.5	Z	68 3/7	26
22 mm	13	Z+1	70	27