INSIDE DIAMETER (MM)

CIRCUMFERENCE (MM)

INDIAN

US / CANADA

UK & AUSTRALIAN

14.86

46.68

7

4

H 1/2

15.27

47.97

8

4.5

I 1/2

15.70

49.32

9

5

J 1/2

16.10

50.58

10

5.5

L

16.51

51.87

12

6

M

16.92

53.16

13

6.5

N

17.35

54.51

14

7

O

17.75

55.76

15

7.5

P

18.19

57.15

16

8

Q

18.53

58.21

17

8.5

Q 3/4

18.89

59.34

18

9

R 3/4

19.41

60.98

19

9.5

S 3/4

19.84

62.33

20

10

T 1/2

20.68

64.97

21

11

V 1/2