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A4 scale = 70%

Cycle transmission notes page 11

Gear charts

To display the gear chart for your particular cycle, click on the 'X' for its crank length (axle-centre to pedal-centre) and tyre size (written on the tyre of the propelled wheel):

 
 		crank length (mm)
 100105110115120125130135140145150155160165170175180185
 700C tyres
42-622-----XXXXXXXXXXXXX
38-622----XXXXXXXXXXXXXX
32-622----XXXXXXXXXXXXXX
28-622----XXXXXXXXXXXXXX
25-622---XXXXXXXXXXXXXXX
22-622---XXXXXXXXXXXXXXX
 MTB tyres
65-559----XXXXXXXXXXXXXX
54-559---XXXXXXXXXXXXXXX
47-559---XXXXXXXXXXXXXXX
44-559---XXXXXXXXXXXXXXX
38-559--XXXXXXXXXXXXXXXX
32-559--XXXXXXXXXXXXXXXX
 Other tyres
32-590---XXXXXXXXXXXXXXX
28-541-XXXXXXXXXXXXXXXXX
44-507-XXXXXXXXXXXXXXXXX
32-451XXXXXXXXXXXXXXXXXX
45-406XXXXXXXXXXXXXXXXXX
32-369XXXXXXXXXXXXXXXXXX
35-349XXXXXXXXXXXXXXXXXX

 

For other tyres and cranks, calculate the ratio (wheel radius / crank length) and click on the nearest value below. Use mm or inches but don't mix them! The wheel radius is half its height - alternatively you can calculate it from the ISO size written on its tyre.

For example, if you have 170mm cranks and 28-622 tyres:

 

  wheel radius / crank length :  1.01.11.21.31.41.51.61.71.81.9
2.02.12.22.32.42.52.62.72.82.9

 

© Chris Bell, 2007
HIGHPATH ENGINEERING
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