700 x 23c circumference - Triathlon Week

08-23-2004, 08:09 PM

I recently came into possession of a low end Bell cycle computer but didn't
get the documentation. Can anyone confirm the figure I have of 2096mm for
the circumference of a 700x23c?

08-23-2004, 08:09 PM

You may want to check out Sheldon Brown's Cyclecomputer Calibration Chart,
he's got 2097 for that tire size with a different make of computer, so
you're close. It's at [Only registered and activated users can see links. ]

My preference is to fill my tires to the recommended pressure, place the
valve stem over a crack in the sidewalk or a mark I can measure from, then
get astride the bike so you have your normal weight on it and roll it for
one revolution of the wheel. Mark the point where the valve stem is now
then make the measurement for the cyclecomputer from the mark you started.
If you don't have a tape that does metric, it's 2.54cm per inch. I set my
computers up for MPH so my measurements are often in inches anyway.

Lon

"Brad Hubbard" <not.real@of.course> wrote in message
news:IHWNc.20879$[Only registered and activated users can see links. ].au...
> I recently came into possession of a low end Bell cycle computer but
didn't
> get the documentation. Can anyone confirm the figure I have of 2096mm for
> the circumference of a 700x23c?

08-23-2004, 08:09 PM

Mac wrote:

> You may want to check out Sheldon Brown's Cyclecomputer Calibration Chart,
> he's got 2097 for that tire size with a different make of computer, so
> you're close. It's at
> [Only registered and activated users can see links. ]
>
> My preference is to fill my tires to the recommended pressure, place the
> valve stem over a crack in the sidewalk or a mark I can measure from, then
> get astride the bike so you have your normal weight on it and roll it for
> one revolution of the wheel. Mark the point where the valve stem is now
> then make the measurement for the cyclecomputer from the mark you started.
> If you don't have a tape that does metric, it's 2.54cm per inch. I set my
> computers up for MPH so my measurements are often in inches anyway.

Thanks Lon,

I'll give it a try.

Brad