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| US / Canada |
UK / Australia |
EU |
Spain |
Diameter (mm) |
Circumference (mm) |
| 6 |
L½ |
52 |
12 |
16.5 |
51.8 |
| 6.5 |
M½ |
53 |
13 |
16.9 |
53.1 |
| 7 |
N½ |
54 |
14.5 |
17.3 |
54.4 |
| 7.5 |
O½ |
56 |
15.5 |
17.7 |
55.6 |
| 8 |
P½ |
57 |
17 |
18.1 |
56.9 |
| 8.5 |
Q½ |
58 |
18.5 |
18.5 |
58.1 |
| 9 |
R½ |
59 |
19.5 |
18.9 |
59.4 |
| 9.5 |
S½ |
61 |
21 |
19.4 |
61.0 |
| 10 |
T½ |
62 |
22.5 |
19.8 |
62.2 |
| 10.5 |
U½ |
63 |
23.5 |
20.2 |
63.5 |
| 11 |
V½ |
65 |
25 |
20.6 |
64.7 |
| 11.5 |
W½ |
66 |
26 |
21.0 |
66.0 |
| 12 |
X½ |
67 |
27.5 |
21.4 |
67.2 |
| 12.5 |
Y½ |
68 |
28.5 |
21.8 |
68.5 |
| 13 |
Z½ |
70 |
30 |
22.2 |
69.7 |
| 13.5 |
Z+1½ |
71 |
31 |
22.6 |
71.0 |
| 14 |
Z+2½ |
72 |
32.5 |
23.0 |
72.3 |
| 14.5 |
Z+3½ |
74 |
33.5 |
23.4 |
73.5 |
| 15 |
Z+5 |
75 |
35 |
23.8 |
74.8 |