Methods and formulas
Each method page explains one formula in depth and lists the calculators that use it.
Methods and formulas
- Gear ratio, gear inches, development and gain ratioHow a bicycle gear is measured: the plain ratio, gear inches, meters of development and gain ratio, with the formulas and charts for common sprockets.
- Bike speed from cadence, gear and wheelHow speed follows from cadence, gear and wheel size on a bicycle, and how to turn it round to find the cadence for a speed, with charts for a cassette.
- Gear range of a drivetrainHow the gear range of a bicycle drivetrain is worked out from its largest and smallest sprockets, and why range alone does not tell you the lowest gear.
- Skid patches on a fixed gearWhy a fixed gear wears its rear tire in a fixed number of places, how to count them for one foot or either foot, and a chart of common gears.
- Wheel circumference from the tire sizeHow the circumference of a bicycle wheel is worked out from the ISO or ETRTO marking on the tire, how exact that is, and a chart for common sizes.