UK / AUS US EU Inside Diameter mm Circ.
mm
F
3
44
14.1
44.2
G
3.5
45
14.5
45.5
H
4
46
14.9
46.7
I
4.5
48
15.3
48
J 5 49 15.5 48.7
K 5.5 50 15.9 49.9
L 6 51 16.3 51.2
M 6.5 53 16.7 52.5
N 7 54 17.1 53.8
O 7.5 55 17.5 55
P 8 56 17.9 56.3