Guides
How these motorcycle calculators think
The guides explain the same formulas the tools use. They are written for a rider who already has a sprocket pair or a tire stamp and wants the assumption in plain language.
Final drive, acceleration, and cruising RPM
What a shorter or taller sprocket pair changes, and what it does not change.
Reading a motorcycle tire size
Width, aspect, and rim, and the circumference this site estimates from them.
US MPG and the metric switch
Why the default gallon is the US gallon, and how km/L is shown.
Why speed in gear is an estimate
The kinematic model, tire circumference, and the difference from a GPS reading.