700 x 23c circumference

Brad Hubbard said:

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?

If you have a low-end wheel to go with the low-end computer, as well as a tape measure, you could measure the roll-out yourself.

OR

You could satisfy your curiosity by looking at

http://www.sheldonbrown.com/cyclecomputer_calibration.html

and find that 2097 is the corresponding number in the table.

Ritch

ritcho said:

Brad Hubbard said:

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?

If you have a low-end wheel to go with the low-end computer, as well as
a tape measure, you could measure the roll-out yourself.

Sarcasm?

I didn't measure it because I was not confident of measuring it accurately.
Why don't you measure your own low-end wheel and see if you get 2097mm
exactly?

Brad

Best way to measure is to place the wheel on the ground with the air valve right at the bottom of the wheel. Mark the starting point on the gound. Move your bike forward until the wheel has done a complete revolution and the valve is at the bottom again. Mark that point, then measure the distance between both points.

jazmo said:

Best way to measure is to place the wheel on the ground with the air valve right at the bottom of the wheel. Mark the starting point on the gound. Move your bike forward until the wheel has done a complete revolution and the valve is at the bottom again. Mark that point, then measure the distance between both points.

I think Sheldon also suggested sitting on the bike while someone pushes
you along a very straight path and measuring as per jazmo's details..
This gives you the tyre deformation differential (ooh big words.. )
Just set it rough - it's still gonna be more accurate than a car.

hippy

hippy said:

I think Sheldon also suggested sitting on the bike while someone pushes
you along a very straight path and measuring as per jazmo's details..
This gives you the tyre deformation differential (ooh big words.. )
Just set it rough - it's still gonna be more accurate than a car.

hippy

Interesting point (i.e having someone sit on the bike).

"jazmo" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Best way to measure is to place the wheel on the ground with the air
valve right at the bottom of the wheel. Mark the starting point on the
gound. Move your bike forward until the wheel has done a complete
revolution and the valve is at the bottom again. Mark that point, then
measure the distance between both points.

--
jazmo

How about you do the same thing but sit on the bike and do it over 10 or 20
revolutions so that you get a more accurate measurement.

Marty

Marty Wallace said:

"jazmo" <[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Best way to measure is to place the wheel on the ground with the air
valve right at the bottom of the wheel. Mark the starting point on the
gound. Move your bike forward until the wheel has done a complete
revolution and the valve is at the bottom again. Mark that point, then
measure the distance between both points.

--
jazmo

How about you do the same thing but sit on the bike and do it over 10 or 20
revolutions so that you get a more accurate measurement.

Marty

good thinking. might try that one.

quote='Brad Hubbard'ritcho said:

Brad Hubbard said:

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?

If you have a low-end wheel to go with the low-end computer, as well as
a tape measure, you could measure the roll-out yourself.

Sarcasm?

I didn't measure it because I was not confident of measuring it accurately.
Why don't you measure your own low-end wheel and see if you get 2097mm
exactly?

Brad[/QUOTE]

Not sarcasm, just being silly - sorry if I caused offence.

I think 2096/7 is close enough...

Ritch

ritcho said:

Not sarcasm, just being silly - sorry if I caused offence.

Sorry if I over-reacted.

Quoted message said:

I think 2096/7 is close enough...

Thanks,
Brad

Thanks to all, there's some good ideas here.

Cheers,
Brad