setting up a cycle comp

[jim55]

iv lost my manual for mine ,does anyone have an idea about what figure i should use when setting the wheel size ,its 700 and im running 25mm tyres, the default
(lowest) reading is 208, and it goes up one at at a time (208,209,210 ,,,,,)anyone set one up recently
its a cheapo mecury make so not hi tech

 

[MontyVeda]

measure the circumference of your wheel in mm and input the result.

 

[jim55]

it goes as i said 208,209..... ,iv measured the wheel and its 680 mm ,i cant see a way of converting this is it mm to inches ?i,e 680 mm to ?inches

 

[craven2354]

26 and 25/32's of an inch

 

[evo456]

Are the results in cm?? If so, 700c = 29 in (diameter), x2.52 to get cm = 73.1 * 3.14159 (pi)= 230cm ish?

If you diameter is 680mm (roughly 27in) - following the formula above gets you around 214.

 

[HLaB]

You could try Sheldon's site http://www.sheldonbrown.com/cyclecomputer-calibration.html . I'm guessing at its a type C and its the circumference in cm's.

Edit: if I'm right its 211cm for 700x25c tyres

 

[Rob3rt]

Do a roll out test!