RG

Diameter (mm)

Circumference (mm)

RG

Diameter (mm)

Circumference (mm)

1

13

40.8

16

18

56.5

2

13+1/3

41.9

17

18+1/3

57.6

3

13+2/3

42.9

18

18+2/3

58.6

4

14

44.0

19

19

59.7

5

14+1/3

45.0

20

19+1/3

60.7

6

14+2/3

46.1

21

19+2/3

61.8

7

15

47.1

22

20

62.8

8

15+1/3

48.2

23

20+1/3

63.9

9

15+2/3

49.2

24

20+2/3

64.9

10

16

50.3

25

21

66.0

11

16+1/3

51.3

26

21+1/3

67.0

12

16+2/3

52.4

27

21+2/3

68.1

13

17

53.4

28

22

69.1

14

17+1/3

54.5

29

22+1/3

70.2

15

17+2/3

55.5

30

22+2/3

71.2