jock Posted September 27, 2013 Share Posted September 27, 2013 I have a 129mm top pulley and 57mm small what reduction is that =3.1 2.4 etc cheers, Quote Link to comment Share on other sites More sharing options...
Hann__ Posted September 27, 2013 Share Posted September 27, 2013 2.26:1 Assuming your measurements are the diameter of the pulleys, your engine pulley has a circumference of 179mm and your prop pulley 405mm. 405/179 = 2.26 Cheers, Hann Quote Link to comment Share on other sites More sharing options...
jock Posted September 27, 2013 Author Share Posted September 27, 2013 Thaks Hann/// Quote Link to comment Share on other sites More sharing options...
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