大家如果無得來舖試岩圈位, 可以自己度再對番個港圈.

圓周 (mm)	直徑 (mm)	香港圈號
38	12.1
38.5	12.3
39	12.4	1
39.5	12.6
40	12.7	2
40.5	12.9
41	13	3
41.5	13.2
42	13.4	4
42.5	13.5
43	13.7
43.5	13.8	5
44	14
44.5	14.2	6
45	14.3
45.5	14.5	7
46	14.6
46.5	14.8	8
47	15
47.5	15.1	9
48	15.3
48.5	15.4
49	15.6	10
49.5	15.8
50	15.9	11
50.5	16
51	16.2	12
51.5	16.4
52	16.5	13
52.5	16.7
53	16.9	14
53.5	17
54	17.2
54.5	17.3	15
55	17.5
55.5	17.7	16
56	17.8
56.5	18	17
57	18.1
57.5	18.3	18
58	18.5
58.5	18.6	19
59	18.8
59.5	18.9
60	19.1	20
60.5	19.3
61	19.4	21
61.5	19.6
62	19.7	22
62.5	19.9
63	20	23
63.5	20.2
64	20.4	24
64.5	20.5
65	20.7
65.5	20.8	25
66	21
66.5	21.2	26
67	21.3
67.5	21.5	27
68	21.6
68.5	21.8	28
69	22
69.5	22.1	29