Does a smaller rear sprocket make you go faster?

Substituting a larger front or smaller rear sprocket lowers the ratio (sometimes called “taller” gearing), resulting in more speed for a given engine rpm. Likewise, a smaller front or larger rear sprocket gives less speed for a given rpm (“shorter” gearing).

How do I choose a sprocket combination?

So, which sprocket should you change to achieve the effect you want? For taller gearing, a one-tooth-larger countershaft sprocket is often the best bet. For more subtle changes, combine that plus-one-tooth front sprocket change with a minus-one-tooth change at the rear sprocket.

How are sprocket combinations calculated?

To determine the final drive ratio, divide the rear sprocket size, say 49 teeth, by the front or countershaft sprocket size, say 13 teeth (like a new Yamaha YZ250F). In this case, the Final Drive Ratio is 3.77 – the front sprocket revolves 3.77 times to make one complete revolution of the rear sprocket.

What tooth sprocket should I use?

How do I choose a sprocket?

Determine the number of teeth of the small sprocket. The number of teeth for the large sprocket is determined by multiplying the number of teeth for the small sprocket by the speed ratio. More than 15 teeth on the small sprocket is recommended. The number of teeth on the large sprocket should be less than 120.

Does more teeth mean more torque?

A gear ratio greater than 1:1 is achieved when a smaller gear (reduced size) with fewer number of teeth meshes and drives a larger gear with greater number of teeth. The rotary machine’s output torque is increased by multiplying the torque by the gear ratio, less some efficiency losses.

What is pitch diameter of sprocket?

The sprocket pitch diameter is an imaginary circle through which the chain pin centers move around the sprocket. The pitch diameter is the fundamental design geometry that determines the size shape and form of the sprocket teeth dimensions.