Size
Circumference
(mm)
Diameter
(mm)
4
46.8
14.9
4.5
48
15.3
5
49.3
15.7
5.5
50.6
16.1
6
51.9
16.5
6.5
53.1
16.9
7
54.4
17.3
7.5
55.7
17.7
8
57
18.1
8.5
58.3
18.5
9
59.5
19
9.5
60.8
19.4
10
62.1
19.8