Wheel size/ tyre circumference

[BigonaBianchi]

Im fitting a new bike computer...el cheapo lidl special....it asks for my Wheel size and tyre circumference.
I cant figure out the format it requires though....but anyway im on Schwalble durano + tyres 700x23

so what is the tyre circumference...23?

The format in the computer is four digets

it look like this

SET WS
26 23

im confussed....bit dim...anyway what numbers should I put under SET and WS?

TA

 

[accountantpete]

It's the circumference of the tyre in mm so that the computer know how far you have traveled in one revolution.

You can measure it - mark a spot on the tyre and floor and then push the bike forward until it comes to that spot and mark the floor - then measure the distance.

a 700x23 should be around 2133

 

[BigonaBianchi]

That's great ..thanks !

 

[MrJamie]

If you're really pedantic, sit on the bike while youre pushing it forward a wheel rotation as the tyre deforms and the effective circumference shortens under load

 

[Monsieur]

I'll check my computer instructions tomorrow.
My tyre size is 730 x 38c and my circumference is 2180

 

[BigonaBianchi]

" and my circumference is 2180"


..no wonder you are a well known member

 

[Monsieur]