Roy Gardiner's web pages

You can do various cycling-related calculations here. Where more than one number is required (list of sprockets; times hours, minutes, seconds) just enter a list separated by blank space; no commas. The gear calculator is a simple version; for the Real McCoy see Sheldon Brown's rendition, or MachineHead software which you may well prefer to this as it has a wide range of cycling software.

Calculate gears
Ring sizes	Sprocket sizes	Wheel size	English/European style

or you can select your own wheel diameter or circumference, which overrides the selection of wheel size above
	select a speed to get cadences

Get chainwheel/sprocket combinations that produce required gear
Gear	Wheel size

or you can select your own wheel diameter or circumference, which overrides the selection of wheel size above

Body Mass Index
	Height(metres)	Weight(kg)	BMI

Normal weight = 18.5-24.9 Overweight = 25-29.9 Obesity = BMI of 30 or greater

Average speed
	Distance	Distance Unit	Time	Average speed

For the time, one number is assumed to be seconds, 2 as minutes/seconds, 3 as h/m/s

Calculations

Calculate gears

Get chainwheel/sprocket combinations that produce required gear

Body Mass Index

Average speed