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SOLTRA Lawn Tractor Racing Pulley Ratios

This is a basic guide to pulley selection. Transmission types, 3 speed to 6 speed transaxles will vary these ratios. The size of your rear tires will also have an impact on the speed.
 
Note: Speed is measured in MPH/KPH
 

3" ENGINE PULLEY

TRANS PULLEY

PULLEY RATIO

SPEED

3 inch

1.000

21.50 / 34.60

3.5 inch

0.857

18.43 / 29.66

4 inch

0.750

16.13 / 25.96

4.5 inch

0.667

14.34 / 23.07

5 inch

0.600

12.90 / 20.76

5.5 inch

0.545

11.72 / 18.86

6 inch

0.500

10.75 / 17.30

6.5 inch

0.462

9.93 / 15.98

3.5" ENGINE PULLEY

TRANS PULLEY

PULLEY RATIO

SPEED

3 inch

1.167

25.09 / 40.38

3.5 inch

1.000

21.50 / 34.60

4 inch

0.875

18.81 / 30.27

4.5 inch

0.778

16.73 / 26.92

5 inch

0.700

15.05 / 24.22

5.5 inch

0.636

13.67 / 21.99

6 inch

0.583

12.53 / 20.17

6.5 inch

0.538

11.57 / 18.62

4" ENGINE PULLEY

TRANS PULLEY

PULLEY RATIO

SPEED

3 inch

1.333

28.66 / 46.12

3.5 inch

1.143

24.57 / 39.54

4 inch

1.000

21.50 / 34.60

4.5 inch

0.888

19.09 / 30.72

5 inch

0.800

17.20 / 27.68

5.5 inch

0.727

15.63 / 25.15

6 inch

0.667

14.34 / 23.08

6.5 inch

0.615

13.22 / 21.28

4.5" ENGINE PULLEY

TRANS PULLEY

PULLEY RATIO

SPEED

3 inch

1.500

32.25 / 51.90

3.5 inch

1.286

27.65 / 44.50

4 inch

1.125

24.19 / 38.93

4.5 inch

1.000

21.50 / 34.60

5 inch

0.900

19.35 / 31.14

5.5 inch

0.818

17.59 / 28.31

6 inch

0.750

16.13 / 25.96

6.5 inch

0.692

14.88 / 23.95

5" ENGINE PULLEY

TRANS PULLEY

PULLEY RATIO

SPEED

3 inch

1.667

35.84 / 57.68

3.5 inch

1.429

30.72 / 49.44

4 inch

1.250

26.88 / 43.26

4.5 inch

1.111

23.89 / 38.45

5 inch

1.000

21.50 / 34.60

5.5 inch

0.909

19.54 / 31.47

6 inch

0.833

17.91 / 28.82

6.5 inch

0.769

16.53 / 26.60

5.5" ENGINE PULLEY

TRANS PULLEY

PULLEY RATIO

SPEED

3 inch

1.833

39.41 / 63.42

3.5 inch

1.571

33.78 / 54.36

4 inch

1.375

29.56 / 47.57

4.5 inch

1.222

26.27 / 42.28

5 inch

1.100

23.65 / 38.06

5.5 inch

1.000

21.50 / 34.60

6 inch

0.917

19.72 / 31.74

6.5 inch

0.846

18.19 / 29.27

6" ENGINE PULLEY

TRANS PULLEY

PULLEY RATIO

SPEED

3 inch

2.000

43.00 / 69.20

3.5 inch

1.714

36.85 / 59.30

4 inch

1.500

32.25 / 51.90

4.5 inch

1.333

28.66 / 46.12

5 inch

1.200

25.80 / 41.52

5.5 inch

1.090

23.44 / 37.72

6 inch

1.000

21.50 / 34.60

6.5 inch

0.923

19.85 / 31.95

6.5" ENGINE PULLEY

TRANS PULLEY

PULLEY RATIO

SPEED

3 inch

2.167

46.59 / 74.98

3.5 inch

1.857

40.31 / 64.87

4 inch

1.625

34.94 / 56.23

4.5 inch

1.444

31.05 / 49.97

5 inch

1.300

27.95 / 44.98

5.5 inch

1.182

25.41 / 40.89

6 inch

1.083

23.28 / 37.47

6.5 inch

1.000

21.50 / 34.60

7" ENGINE PULLEY
TRANS PULLEY
PULLEY RATIO
SPEED
3 inch
2.333
50.16 / 80.72
3.5 inch
2.000
43.00 / 69.20
4 inch
1.750
37.63 / 60.56
4.5 inch
1.556
33.45 / 53.83
5 inch
1.400
30.10 / 48.44
5.5 inch
1.273
27.37 / 44.05
6 inch
1.167
25.09 / 40.38
6.5 inch
1.077
23.15 / 37.26
 






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