Main Motorcycle: 1968 Norton 650 SS
Join Date: Oct 2012
Other Motorcycle: 1982 Maico 490 Alpha One
Extra Motorcycle: Ossa 250 M.A.R.
Not cumulative but Torque is a function of the gear ratio, in direct proportion.
If you gear a given motor to a load at 1 to 1and have 10 ft lbs available then lower gearing by 10% (1.1 motor rev to 1 load rev) , you will have 11 ft lbs available, or 10% more torque available.
Gear ratio is determined by dividing sprocket sizes.
You can use diameters or radii, or the most common, number of teeth, it doesn't matter which, as long as you are consistent ( r/r or d/d or t/t)
Changing the number of teeth of one sprocket 7% changes the diameter of one sprocket by 7% and also changes the radius by 7%, so it changes the gear ratio and torque at wheel in each gear by same.
To be precise, changing to a 17 tooth from a 16 tooth will give a 6.25% increase in gear ratio.
Last edited by worntorn; 05-20-2019 at 02:39 PM.