: : : SIZE GUIDE : : :

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

We do offer quarter sizes by special request.

In the shopping cart, please use the ‘add order note’ button 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	12
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