Diameter in mm Australia & New Zealand USA & Canada
15.1 I 4 1/2
15.5 J 4 3/4
16 K 5 1/4
16.3 L 5 3/4
16.7 M 6 1/4
17.1 N 6 3/4
17.4 O 7 1/4
17.7 P 7 3/4
18.1 Q 8 1/4
18.5 R 8 3/4
18.9 S 9 1/4
19.4 T 9 3/4
19.8 U 10 1/4
20.3 V 10 3/4
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