SIZE (inches)

SIZE (mm)

DIAMETER (mm)

USA & CANADA

AU, NZ, UK, & IRELAND

FR

GERMANY, BELGIUM, SCANDINAVIA

ITALY

JAPAN, CHINA, & INDIA

1 - 15/16

49

15.7

5

J - 1/2

15 - 3/4

9.5

9.5

9

2 - 1/16

52

16.51

6

M

16 - 1/2

11.5

11.5

12

2 - 3/16

55

17.35

7

O

17 - 1/4

14.5

14.5

14

2 - 5/16

57

18.19

8

Q

18

17

17

16

2 - 7/16

59

18.89

9

R - 1/2

19

19.5

19.5

18

2 - 9/16

62

19.84

10

T - 1/2

20

22

22

20