UK American Inside Diameter (mm) Inside Circumference (mm)
K 5 1/4 15.9 50
L 5 3/4 16.31 51.2
M 6 1/4 16.71 52.5
N 6 3/4 17.12 53.8
O 7 1/4 17.53 55.1
P 7 3/4 17.93 56.3
Q 8 1/4 18.34 57.6
R 8 3/4 18.75 58.9
S 9 1/4 19.15 60.2
T 9 3/4 19.56 61.4
U 10 1/4 19.96 62.7
V 10 3/4 20.37 64

 

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