tyre circumference

[fandacious]

what is the circumference of a 700 x 23C tyre???

[TNT1]

Circumference
= Pi (3.14) times Diameter (C=pD)

[fandacious]

thanks for the grade 7 maths lesson...

 

now what is the circumference in mm...

[TNT1]

A 700c rim is 622 mm across the "bead seat". Bicycle tires are nearly

circular in cross section so the nominal width is also the height. For

a 700c wheel with a 23 mm tire, the diameter would be very close to

622+(2*23) = 668 mm. Then the circumference would be 668*Pi

(3.14159....) = 2098.6 mm. So that's where the recommended 2100 came

from.

 

Happy?

 

TNT12008-06-05 05:03:29

[mtbfreak]

depends on the profile of the tyre....mark the tyre, mark the ground, roll it out for one revolution and measure the start and end on he ground in inches and divide by 25,4 to get mm

[fandacious]

Happy?

 

Ecstatically

 

thanks

[TNT1]

New computer?

[fandacious]

depends on the profile of the tyre....mark the tyre' date=' mark the ground, roll it out for one revolution and measure the start and end on he ground in inches and divide by 25,4 to get mm

[/quote']

 

or just measure the start and the end in mm

[Guest Big H]

A 700c rim is 622 mm across the "bead seat". Bicycle tires are nearly circular in cross section so the nominal width is also the height. For a 700c wheel with a 23 mm tire' date=' the diameter would be very close to 622+(2*23) = 668 mm. Then the circumference would be 668*Pi (3.14159....) = 2098.6 mm. So that's where the recommended 2100 came from.

Happy?
[/quote']

 

The bead seat for the "new" 29 niner MTB wheel is also 622 mm.