Re: How to Measure Cadence?
On 6/8/04 1:10 pm, in article
4113751D.10269B3@quadratec-software.com,
"Elisa Francesca Roselli" <Elisa.Francesca.Roselli@quadratec-software.com>
wrote:
> Is there any rule of thumb method to estimate cadence on a bike without
> a function on the cyclocomputer?
The rollout distance for one revolution of a cycle tyre is approx 2m
The number of revolutions such a tyre makes per hour at 24 km/h is 12,000.
Dividing this by 60 gives 200 rpm.
Now all you have to do is to know your gear ratio. 38x19 is 2 so would be a
cadence of 100 at 24km/h
A bit of mental arithmetic can then give you the approximate answer.
ie 25km/h instead of 24 would be an extra 4 pedals per minute to give 104.
38x15 instead of 19 would be about 20-25% less, or between 75 - 80.
Once you have one mark to go on the rest can be estimated by extrapolation.
Or you can program the relevant formula into excel and print out a set of
tables to tape to your map holder..
...d
>
> Thanks
> EFR
> Ile de France
>