Diametro interno mm Circonferenza mm Italia USA Canada Francia UK Giappone Germania
14 44 4 3 44 F 4 14
14.3 45 5 45
14.6 46 6 46 H
15 47 7 47 I
15.3 48 8 4½ 48 I½ 8
15.6 49 9 49 J 15¾
15.9 50 10 50 K
16.2 51 11 51 L½ 11
16.6 52 12 52
16.9 53 13 6½ 53 N
17.2 54 14 7 54 O 14 17¼
17.5 55 15 17½
17.8 56 16 7¾ P
18.1 57 17 8½ 57 Q 16 18½
18.5 58 18 58 R 17 18
18.8 59 19
19.1 60 20 9 59 S 18 19
19.4 61 21 T 19¾
19.7 62 22 10 62
20.0 63 23 10½ U 22 20½
20.4 64 24 11 V 23 20¾
20.7 65 25 65 W
21.0 66 26 66 X
21.3 67 27 12 66½ 25
21.7 68 28 12½ 67¾ 26 21¾
22.0 69 29
22.3 70,1 30 13 70 Z+1 27 22