"Gear ratio motorcycle" is a utility to calculate the speed of a motorcycle according to the change of one or more variables.
In the transmission of a motorcycle there are many variables that affect the final speed.
Some are easy: front sprocket, rear sprocket or rear wheel tire size (rim diameter, or height of the tire and tire size).
While the others have the characteristics of each model: the primary reduction ratio and the gears ratio.
With "Gear ratio bike calculator" you can instantly see the effect of each change on the final speed in any gear and rpm.