| Circumference (mm) |
Diameter (mm) |
Aus / UK size |
US size |
| 51.2 |
16.3 |
L |
6 |
| 52.5 |
16.7 |
M |
6.5 |
| 53.8 |
17.1 |
N |
7 |
| 55.1 |
17.5 |
O |
7.5 |
| 56.3 |
17.9 |
P |
8 |
| 57.6 |
18.3 |
Q |
8.5 |
| 58.9 |
18.8 |
R |
9 |
| 60.2 |
19.2 |
S |
9.5 |
| 61.4 |
19.6 |
T |
10 |
| 62.7 |
20.0 |
U |
10.5 |
| 64.0 |
20.4 |
V |
11 |
| 65.2 |
20.8 |
W |
11 .5 |
| 66.5 |
21.2 |
X |
12 |
