An Easier Way to Measure Circumference

Mesuring Tyre DiameterThe most obvious way of measuring the circumference of your wheel is by rolling it across the floor. Stick a strip of masking tape across the tyre so you'll know exactly when one revolution has been made. The slightest wobble off a straight line will result in a wrong measurement so best use a tiled floor (pencil marks come off more easily, too).

There is a far simpler way: measure the diameter of the wheel in the same way that you measure a person's height. Click photo for enlargement.

Multiply the wheel's diameter by pi to find its circumference – just use your calculator.

  • 681mm (tyre diameter) x pi = 2140mm (circumference)

  Bicycle Gears Explained
  -->Metres Development – metres travelled per pedal revolution.
-->Pedalling Cadence – pedalling r/min x gear selected = speed.
-->Tyre Circumference – an easy way to measure it.
-->Derailleur Gears – simple formula for calculating metres development.
-->Hub Gears – not-so-simple formula for calculating metres development.
-->Gain Ratio – distance bike travels : distance pedals moves.
-->Gear Inches – archaic system for penny-farthing high wheelers.
  BABS.CO » Bicycle Gears » Pedalling Candence  
2013-03-26 19:28

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