Diameter (MM) Circumference (MM) US / CA UK / AU
14.07 44.20 3 F
14.27 44.83 3.25 F 1/2
14.48 45.49 3.5 G
14.68 46.12 3.75 G 1/2
14.88 46.75 4 H
15.09 47.41 4.25 H 1/2
15.29 48.03 4.5 I
15.49 48.66 4.75 I 1/2
15.70 49.32 5 J
15.90 49.95 5.25 J 1/2
16.10 50.58 5.5 K
16.31 51.24 5.75 K 1/2
16.51 51.87 6 L
16.71 52.62 6.25 L 1/2
16.92 53.16 6.5 M
17.12 53.78 6.75 M 1/2
17.32 54.41 7 N
17.53 55.07 7.25 N 1/2
17.73 55.70 7.5 O
17.93 56.33 7.75 O 1/2
18.14 56.99 8 P
18.34 57.74 8.25 P 1/2
18.54 58.24 8.5 Q
18.75 58.90 8.75 Q 1/2
18.95 59.53 9 R
19.15 60.16 9.25 R 1/2
19.35 60.79 9.5 S
19.56 61.45 9.75 S 1/2
19.76 62.08 10 T