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Ratio Charts

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8mm Drive Ratio

Top Pulley

43

44

45

46

47

48

49

50

51

52

53

54

55

56

43

1.0

-2.3

-4.5

-6.5

-8.5

-10.4

-12.2

-14.0

-15.7

-17.3

-18.9

-20.4

-21.8

-23.2

44

-2.3

1.0

-2.3

-4.3

-6.4

-8.3

-10.2

-12.0

-13.7

-15.4

-17.0

-18.5

-20.0

-21.4

45

4.7

2.3

1.0

-2.2

-4.3

-6.2

-8.2

-10.0

-11.8

-13.5

-15.1

-16.7

-18.2

-19.6

46

7.0

4.5

2.2

1.0

-2.1

-4.2

-6.1

-8.0

-9.8

-11.5

-13.2

-16.4

-16.4

-17.9

47

9.3

6.8

4.4

2.2

1.0

-2.1

-4.1

-6.0

-7.2

-9.6

-11.3

-13.0

-14.5

-16.1

B

48

11.6

9.1

6.7

4.3

2.1

1.0

2.0

-4.0

-5.9

-7.7

-9.4

-11.1

-12.7

-14.3

O

49

14.0

11.4

8.9

6.5

4.3

2.1

1.0

-2.0

-3.9

-5.8

-7.5

-9.3

-10.9

-12.5

T

50

16.3

13.6

11.1

8.7

6.4

4.2

2.0

1.0

-2.0

-3.8

-5.7

-7.4

-9.4

-10.7

T

51

18.6

15.9

13.3

10.9

8.5

6.3

4.1

2.0

1.0

-1.9

-3.8

-5.6

-7.3

-8.9

O

52

20.9

18.2

15.6

13.0

10.6

8.3

6.1

4.0

2.0

1.0

-1.9

-3.7

-5.5

-7.1

M

53

23.2

20.5

17.8

15.2

12.8

10.4

8.2

6.0

3.9

1.9

1.0

-1.9

-3.6

-5.4

54

25.5

22.7

20.0

17.4

14.9

12.5

10.2

8.0

5.9

3.8

1.9

1.0

-1.8

-3.6

P

55

27.9

25.0

22.2

19.6

17.0

14.6

12.2

10.0

7.8

5.8

3.8

1.9

1.0

-1.8

U

56

30.2

27.3

24.4

21.7

19.1

16.7

14.3

12.0

9.8

7.7

5.7

3.7

1.8

1.0

L

57

32.5

29.5

26.7

23.9

21.3

18.8

16.3

14.0

11.8

9.6

7.5

5.6

3.6

1.8

L

58

34.8

31.9

28.9

26.1

23.4

20.8

18.4

16.0

13.7

11.5

9.4

7.4

5.5

3.6

E

59

37.2

34.1

31.3

28.3

25.5

22.9

20.4

18.0

15.7

13.5

11.3

9.3

7.3

5.4

Y

60

39.5

36.4

33.3

30.4

27.7

25.0

22.4

20.0

17.6

15.4

13.2

11.1

9.1

7.1

61

41.8

38.6

35.6

32.6

29.8

27.1

24.5

22.0

19.6

17.3

15.1

13.0

10.9

8.9

62

44.2

40.9

37.8

34.8

31.9

29.2

26.5

24.0

21.6

19.2

17.0

14.8

12.7

10.7

63

46.5

43.2

40.0

37.0

34.0

31.1

28.6

26.0

23.5

21.2

18.9

16.7

14.5

12.5

64

48.8

45.5

42.2

39.1

36.2

33.3

30.6

28.0

25.5

23.1

20.8

18.5

16.4

14.3

65

51.2

47.7

44.4

41.3

38.3

35.4

32.7

30.0

27.5

25.0

22.6

20.4

18.2

16.1

66

53.5

50.0

46.7

43.5

40.4

37.5

34.7

32.0

29.4

26.9

24.5

22.2

20.0

17.9

67

55.8

52.3

48.9

45.6

42.6

39.6

36.7

34.0

31.4

28.8

26.4

24.1

21.8

19.6

68

58.1

54.5

51.1

47.8

44.7

41.7

38.8

36.0

33.3

30.8

28.3

25.9

23.6

21.4

69

60.5

56.8

53.3

50.0

46.8

43.8

40.8

38.0

35.3

32.7

30.2

27.8

25.5

23.2

70

62.8

59.1

55.6

52.2

48.9

45.8

42.9

40.0

37.3

34.6

32.1

29.6

27.3

25.0

Top Pulley (8mm Continue)

57

58

59

60

61

62

63

64

65

66

67

68

69

70

43

-24.6

-25.9

-27.1

-28.3

-29.5

-30.6

-31.7

-32.8

-33.8

-34.8

-35.8

-36.8

-37.7

-38.6

44

-22.8

-24.1

-25.4

-26.7

-27.9

-29.0

-30.2

-31.2

-32.3

-33.3

-34.3

-35.3

-36.2

-37.1

45

-21.1

-22.4

-23.7

-25.0

-26.2

-27.4

-28.6

-29.7

-30.8

-31.9

32.8

-33.8

-34.8

-35.7

46

-19.3

-20.7

-22.0

-23.3

-24.6

-25.8

-27.0

-28.1

-29.2

-30.3

-31.3

-32.4

-33.3

-34.3

47

-17.5

-19.0

-20.3

-21.7

-23.0

-24.4

-25.4

-26.6

-27.7

-28.8

-29.9

-30.9

-31.9

-32.9

B

48

-15.8

-17.2

-18.6

-20.0

-21.3

-22.6

-23.8

-25.0

-26.2

-27.3

-28.4

-29.4

-30.4

-31.4

O

49

-14.0

-15.5

-16.9

-18.3

-19.7

-21.0

-22.2

-23.4

-24.6

-25.8

-26.9

-27.9

-29.0

-30.0

T

50

-12.3

-13.8

-15.3

-16.7

-18.0

-19.4

-20.0

-21.9

-23.1

-24.2

-25.4

-26.5

-27.5

-28.6

T

51

-10.5

-12.1

-13.6

-15.0

-16.4

-17.7

-19.0

-20.3

-21.5

-22.7

-23.9

-25.0

-26.1

-27.1

O

52

-8.8

-10.3

-11.9

-13.3

-14.8

-16.1

-17.5

-18.8

-20.0

-21.2

-22.4

-23.5

-24.6

-25.7

M

53

-7.0

-8.6

-10.2

-11.7

-13.1

-14.5

-15.9

-17.2

-18.5

-19.7

-20.9

-22.1

-23.2

-24.3

54

-5.3

-6.9

-8.5

-10.0

-11.5

-12.9

-14.3

-15.6

-16.9

-18.2

-19.4

-20.6

-21.7

-22.9

P

55

-3.5

-5.2

-6.8

-8.3

-9.8

-11.3

-12.7

-14.1

-15.4

-16.7

-17.9

-19.1

-20.3

-21.4

U

56

-1.8

-3.4

-5.1

-6.7

-8.2

-9.7

-11.1

-12.5

-13.8

-15.2

-16.4

-17.6

-18.8

-20.0

L

57

1.0

-1.7

-3.4

-5.0

-6.6

-8.1

-9.5

-10.9

-12.3

-13.6

-14.9

-16.2

-17.4

-18.6

L

58

1.8

1.0

-1.7

-3.3

-4.9

-6.5

-7.9

-9.4

-10.8

-12.1

-13.4

-14.7

-15.9

-17.1

E

59

3.5

1.7

1.0

-1.7

-3.3

-4.8

-6.3

-7.8

-9.2

-10.6

-11.9

-13.2

-14.5

-15.7

Y

60

5.3

3.4

1.7

1.0

-1.6

-3.2

-4.8

-6.3

-7.7

-9.1

-10.4

-11.8

-13.0

-14.3

61

7.0

5.2

3.4

1.7

1.0

-1.6

-3.2

-4.7

-6.2

-7.6

-9.0

-10.3

-11.6

-12.9

62

8.8

6.9

5.1

3.3

1.6

1.0

-1.6

-3.1

-4.6

-6.1

-7.5

-8.8

-10.1

-11.4

53

10.5

8.9

6.8

5.0

3.3

1.6

1.0

-1.6

-3.1

-4.5

-6.0

-7.4

-8.7

-10.0

64

12.3

10.3

8.5

6.7

4.9

3.2

1.6

1.0

-1.5

-3.0

-4.5

-5.9

-7.2

-8.6

65

14.0

12.1

10.2

8.3

6.6

4.8

3.2

1.6

1.0

-1.5

-3.0

-4.4

-5.8

-7.1

66

15.8

13.8

11.9

10.0

8.2

6.5

4.8

3.1

1.5

1.0

-1.5

-2.9

-4.3

-5.7

67

17.5

15.5

13.6

11.7

9.8

8.1

6.3

4.7

3.1

1.5

1.0

-1.5

-2.9

-4.3

68

19.3

17.2

15.3

13.3

11.5

9.7

7.9

6.3

4.6

3.0

1.5

1.0

-1.4

-2.9

69

21.1

19.0

16.9

15.0

13.1

11.3

9.5

7.8

6.2

4.5

3.0

1.5

1.0

-1.4

70

22.8

20.7

18.6

16.7

14.8

12.9

11.1

9.4

7.7

6.1

4.5

2.9

1.4

1.0


1/2" Pitch, 13.9mm & 14mm

Top Pulley

  25262728293031323334353637
 

25

1.0-3.8-7.4-10.7-13.8-16.7-19.4-21.9-24.2-26.5-28.6-30.6-32.4
 

26

4.01.0-3.7-7.1-10.3-13.3-16.1-18.7-21.2-23.5-25.7-27.8-29.7
 

27

8.03.81.0-3.6-6.9-10.0-12.9-15.6-18.2-20.6-22.9-25.0-27.0
 

28

12.07.73.71.0-3.4-6.7-9.7-12.5-15.2-17.6-20.0-22.2-24.3
 

29

16.011.57.43.61.0-3.3-6.5-9.4-12.1-14.7-17.1-19.4-21.6
B

30

20.015.411.17.13.41.0-3.2-6.2-9.1-11.8-14.3-16.7-18.9
O

31

24.019.214.810.76.93.31.0-3.1-6.1-8.8-11.4-13.9-16.2
T

32

28.023.118.514.310.36.73.21.0-3.0-5.9-8.6-11.1-13.5
T

33

32.026.922.217.913.810.06.53.11.0-2.9-5.7-8.3-10.8
O

34

36.030.825.921.417.213.39.76.33.01.0-2.9-5.6-8.1
M

35

40.034.629.625.020.716.712.99.46.72.91.0-2.8-5.4
 

36

44.038.533.328.624.120.016.112.59.15.92.91.0-2.7
P

37

48.042.337.032.127.623.319.415.612.18.85.72.81.0
U

38

52.046.240.735.731.026.722.618.815.211.88.65.62.7
L

39

56.050.044.439.334.530.025.821.918.214.711.48.35.4
L

40

60.053.848.142.937.933.329.025.021.217.614.311.18.1
E

41

64.057.751.946.441.436.732.328.124.220.617.113.910.8
Y

42

68.061.555.650.044.840.035.531.327.323.520.016.713.5
 

43

72.065.459.353.648.343.338.734.430.326.522.919.416.2
 

44

76.069.263.057.151.746.741.937.533.329.425.722.218.9
 

45

80.073.166.760.755.250.045.240.636.432.428.625.021.6

 

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