| Canada & USA |
Diameter (mm) |
Europe |
UK & Australia |
| 3 |
14.1 |
44 |
F |
| 3.5 |
14.5 |
45.5 |
G |
| 4 |
14.9 |
47 |
H |
| 4.5 |
15.3 |
48 |
I |
| 5 |
15.7 |
49 |
J ½ |
| 5.5 |
16.1 |
50.5 |
K ½ |
| 6 |
16.5 |
52 |
L ½ |
| 6.5 |
16.9 |
53 |
M ½ |
| 7 |
17.3 |
54.5 |
N ½ |
| 7.5 |
17.8 |
56 |
O ½ |
| 8 |
18.2 |
57 |
P ½ |
| 8.5 |
18.6 |
58.5 |
Q ½ |
| 9 |
19 |
60 |
R ½ |
| 9.5 |
19.4 |
61 |
S ½ |
| 10 |
19.8 |
62 |
T ½ |
| 10.5 |
20.2 |
63.5 |
U ½ |
| 11 |
20.6 |
65 |
V ½ |
| 11.5 |
21.1 |
66 |
W ½ |
| 12 |
21.5 |
67.5 |
X ½ |
| 12.5 |
21.9 |
69 |
Z |
| 13 |
22.3 |
70 |
Z1 |
| 13.5 |
22.7 |
71.5 |
Z2 |
| 14 |
23.1 |
72.5 |
Z3 |
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