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Convert Sizes By Country
Diameter (mm)
diameter (inches)
circumference (mm)
circumference (inches)
British/Australian
14.56
19.22
0.757
60.38
S 1/4
14.65
19.31
0.76
60.66
S 1/2
14.86
19.41
0.764
60.98
S 3/4
15.04
19.51
0.768
61.29
T
15.27
19.62
0.772
61.64
T 1/4
15.4
19.84
0.781
62.33
T 1/2
15.53
20.02
0.788
62.89
U
15.7
20.2
0.797
63.46
U 1/2
15.8
20.32
0.8
63.84
V
15.9
20.44
0.805
64.21
V 1/4
16
20.68
0.814
64.97
V 1/2
16.1
20.76
0.817
65.22
W
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