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US/Canada	Inside Diameter (mm)	Inside Circumference (mm)
3	14.05mm	44.14mm
3 1/4	14.25mm	44.77mm
3 1/2	14.45mm	45.40mm
3 3/4	14.65mm	46.02mm
4	14.86mm	46.68mm
4 1/4	15.04mm	47.25mm
4 1/2	15.27mm	47.97mm
4 3/4	15.53mm	48.79mm
5	15.70mm	49.32mm
5 1/4	15.90mm	49.95mm
5 1/2	16.10mm	50.58mm
5 3/4	16.30mm	51.21mm
6	16.51mm	51.87mm
6 1/4	16.71mm	52.50mm
6 1/2	16.92mm	53.16mm
6 3/4	17.13mm	53.82mm
7	17.35mm	54.51mm
7 1/4	17.45mm	54.82mm
7 1/2	17.75mm	55.76mm
7 3/4	17.97mm	56.45mm
8	18.19mm	57.15mm
8 1/4	18.35mm	57.65mm
8 1/2	18.53mm	58.21mm
8 3/4	18.69mm	58.72mm
9	18.89mm	59.34mm
9 1/4	19.22mm	60.38mm
9 1/2	19.41mm	60.98mm
9 3/4	19.62mm	61.64mm
10	19.84mm	62.33mm
10 1/4	20.02mm	62.89mm
10 1/2	20.20mm	63.46mm
10 3/4	20.44mm	64.21mm
11	20.68mm	64.97mm
11 1/4	20.85mm	65.50mm
11 1/2	21.08mm	66.22mm
11 3/4	21.24mm	66.73mm
12	21.49mm	67.51mm
12 1/4	21.69mm	68.14mm
12 1/2	21.89mm	68.77mm
12 3/4	22.10mm	69.43mm
13	22.33mm	70.15mm

US/Canada

Inside Diameter (mm)

Inside Circumference (mm)

14.05mm

44.14mm

3 1/4

14.25mm

44.77mm

3 1/2

14.45mm

45.40mm

3 3/4

14.65mm

46.02mm

14.86mm

46.68mm

4 1/4

15.04mm

47.25mm

4 1/2

15.27mm

47.97mm

4 3/4

15.53mm

48.79mm

15.70mm

49.32mm

5 1/4

15.90mm

49.95mm

5 1/2

16.10mm

50.58mm

5 3/4

16.30mm

51.21mm

16.51mm

51.87mm

6 1/4

16.71mm

52.50mm

6 1/2

16.92mm

53.16mm

6 3/4

17.13mm

53.82mm

17.35mm

54.51mm

7 1/4

17.45mm

54.82mm

7 1/2

17.75mm

55.76mm

7 3/4

17.97mm

56.45mm

18.19mm

57.15mm

8 1/4

18.35mm

57.65mm

8 1/2

18.53mm

58.21mm

8 3/4

18.69mm

58.72mm

18.89mm

59.34mm

9 1/4

19.22mm

60.38mm

9 1/2

19.41mm

60.98mm

9 3/4

19.62mm

61.64mm

19.84mm

62.33mm

10 1/4

20.02mm

62.89mm

10 1/2

20.20mm

63.46mm

10 3/4

20.44mm

64.21mm

20.68mm

64.97mm

11 1/4

20.85mm

65.50mm

11 1/2

21.08mm

66.22mm

11 3/4

21.24mm

66.73mm

21.49mm

67.51mm

12 1/4

21.69mm

68.14mm

12 1/2

21.89mm

68.77mm

12 3/4

22.10mm

69.43mm

22.33mm

70.15mm

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