Calculations

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. /bk 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.

New version November '06 the old version is still available

In some cases below you can enter a list of numbers, for instance the time in hours minutes and seconds. The list should be separated by blanks, not commas or anything else. 2 4 7 would represent 2 hours 4 minutes 7 seconds. You can omit numbers from the right so 3 2 would be 3 hours 2 minutes 0 seconds. When there's no hours you'd have to write 0 3 2 to get 3 minutes 2 seconds.

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Last updated: 30 Nov 2006

Calculate gears

 Ring sizes Sprocket sizes English/European style inches metres Wheel size 27 inch (nominal) 700 X 25 / 25-622 700 X 23 / 23-622 700 X 20 / 20-622 Tubular / Wide Tubular / Narrow or you can select your own wheel diameter or circumference, which overrides the selection of wheel size above Inches Centimetres Diameter Circumference (Optional) Enter any 2 out of 3 (speed, distance, time) for cadences in all gears & the 3rd of the 3 calculated Speed mph kph Distance Miles Kilometres Time hours minutes seconds

Get chainwheel/sprocket combinations that produce required gear

 Gear inches metres Wheel size 27 inch (nominal) 700 X 25 / 25-622 700 X 23 / 23-622 700 X 20 / 20-622 Tubular / Wide Tubular / Narrow or you can select your own wheel diameter or circumference, which overrides the selection of wheel size above Inches Centimetres Diameter Circumference

Body Mass Index

 Height Metric: One number (e.g 1.57 is 1m 57cm) Imperial: Feet inches separated by blanks (e.g 5 11 is 5 feet 11 inches) Weight Metric: One number (e.g 75.4 is seventy five point four kilos) Imperial: Stone lbs ozs separated by blanks (e.g 12 10 3 is twelve stone, ten lbs, three ozs; designed for UK users who measure weight in stones) lbs ozs separated by blanks (e.g 140 7 is a hundred and forty pounds 7oz; for Americans and others who have no interest in stones) BMI Normal weight = 18.5-24.9   Overweight = 25-29.9    Obesity = BMI of 30 or greater

Average speed

 Distance Miles Kilometres Time Hours minutes seconds, separated by blanks Average speed