MOWER RACING TIPS

PULLEY RATIOS

"CHANGES IN SPEED BASED ON 4000 RPM AND 18" TALL TIRE.
IT DOES NOT TAKE INTO ACCOUNT ANY OTHER GEAR REDUCTION, SUCH AS TRANSAXLE FINAL DRIVE RATIO, OR SPECIFIC GEAR RATIO SELECTED"

SEE ALSO THE GEAR RATIO & SPEED ANALYZER


3"  ENGINE PULLEY
TRANS PULLEY PULLEY RATIO  MPH 
3 inch 1.000 21.50
3.5 inch 0.857 18.43
4 inch 0.750 16.13
4.5 inch 0.667 14.34
5 inch 0.600 12.90
5.5 inch 0.545 11.72
6 inch 0.500 10.75
6.5 inch 0.462 9.93

 
3.5"  ENGINE PULLEY
TRANS PULLEY PULLEY RATIO SPEED
3 inch 1.167 25.09
3.5 inch 1.000 21.50
4 inch 0.875 18.81
4.5 inch 0.778 16.73
5 inch 0.700 15.05
5.5 inch 0.636 13.67
6 inch 0.583 12.53
6.5 inch 0.538 11.57

 
4"  ENGINE PULLEY
TRANS PULLEY PULLEY RATIO SPEED
3 inch 1.333 28.66
3.5 inch 1.143 24.57
4 inch 1.000 21.50
4.5 inch 0.888 19.09
5 inch 0.800 17.20
5.5 inch 0.727 15.63
6 inch 0.667 14.34
6.5 inch 0.615 13.22

 
4.5"  ENGINE PULLEY
TRANS PULLEY PULLEY RATIO SPEED
3 inch 1.500 32.25
3.5 inch 1.286 27.65
4 inch 1.125 24.19
4.5 inch 1.000 21.50
5 inch 0.900 19.35
5.5 inch 0.818 17.59
6 inch 0.750 16.13
6.5 inch 0.692 14.88

 
5"  ENGINE PULLEY
TRANS PULLEY PULLEY RATIO SPEED
3 inch 1.667 35.84
3.5 inch 1.429 30.72
4 inch 1.250 26.88
4.5 inch 1.111 23.89
5 inch 1.000 21.50
5.5 inch 0.909 19.54
6 inch 0.833 17.91
6.5 inch 0.769 16.53

 
5.5"  ENGINE PULLEY
TRANS PULLEY PULLEY RATIO SPEED
3 inch 1.833 39.41
3.5 inch 1.571 33.78
4 inch 1.375 29.56
4.5 inch 1.222 26.27
5 inch 1.100 23.65
5.5 inch 1.000 21.50
6 inch 0.917 19.72
6.5 inch 0.846 18.19

 
6"  ENGINE PULLEY
TRANS PULLEY PULLEY RATIO SPEED
3 inch 2.000 43.00
3.5 inch 1.714 36.85
4 inch 1.500 32.25
4.5 inch 1.333 28.66
5 inch 1.200 25.80
5.5 inch 1.090 23.44
6 inch 1.000 21.50
6.5 inch 0.923 19.85

 
6.5"  ENGINE PULLEY
TRANS PULLEY PULLEY RATIO SPEED
3 inch 2.167 46.59
3.5 inch 1.857 40.31
4 inch 1.625 34.94
4.5 inch 1.444 31.05
5 inch 1.300 27.95
5.5 inch 1.182 25.41
6 inch 1.083 23.28
6.5 inch 1.000 21.50

 
7"  ENGINE PULLEY
TRANS PULLEY PULLEY RATIO SPEED
3 inch 2.333 50.16
3.5 inch 2.000 43,00
4 inch 1.750 37.63
4.5 inch 1.556 33.45
5 inch 1.400 30.10
5.5 inch 1.273 27.37
6 inch 1.167 25.09
6.5 inch 1.077 23.15

 
 

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