700C what is the circumferance in mm?

[brummiewedge]

Need it to set the speedo up, and trying to hold the tape and measure around the wheel is more hassle than asking on here!

[Dr Bob]

<maths answer>
measure the diameter and multiply by 3.14159
</maths answer>
CH

[Roman]

Surely you will need to measure the outer circumference of the tyre when inflated on on the rim?

Draw a line accross the tread of the tyre and then seated on the bike, roll it straight along the floor for more than 1 wheel revolution then measure the distance between the felt tip marks.

[Nick_F]

Circumference varies with tyre size as well as rim size:

700C x 18 = 2070mm
700C x 19 = 2080mm
700C x 20 = 2086mm
700C x 23 = 2096mm
700C x 25 = 2105mm
700C x 28 = 2136mm
700C x 30 = 2170mm
700C x 32 = 2155mm
700C x 35 = 2168mm
700C x 38 = 2180mm

lifted straight from the destructions for my bike computer.

[pdV6]

Nick_F said:

lifted straight from the destructions for my bike computer.

...and approximate depending on the make & model of tyre.

Only accurate way is to measure on the ground as described above.

[Nick_F]

Investments can go down as well as up, your home nmay be at risk etc. etc...

[pdV6]