"...start there and tweek..." says Denny. Good advice, I think.
When I did the rollout method with my Stratus, the result was far from the setting recommended for
the tire in the computer's instruction booklet. I tried both settings and found neither setting
seemingly accurate enough.
What I did, however, was to drive a relatively flat piece of road in two cars (for a double check),
zeroing the trip odometers before starting, for an even 10 miles (it just so happened to be a good
start and end point, but other multiple-mile runs would work, too -- the longer the run, the more
accurate you can set your bike computer).
Then I rode that same stretch of road with my 'bent, zeroing my bike computer's odometer at the
starting point. I made note of the bike computer's miles readout at the end point. Then, with a
simple comparative equation, I found the most accurate setting for my bike computer.
For example, assume at a bike computer setting of 1500, the bike's odometer reads 7.5 miles for an
automobile odometer-measured 8 mile run. Working the comparative equation 7.5/1500 = 8.0/X ----->
7.5X = 12000 -----> X = 1600, which is the accurate setting for this bike's computer.
This is, of course, dependent upon the accuracy of your car's odometer (for instance, are your car's
tires the original size that were fitted when new? Are they significantly worn? etc.). This method
obviously works best using a new or near-new car as the odometer standard. Also, if your bike
computer gives you a readout in hundredths of miles instead of merely tenths, you can arrive at a
much more accurate bike computer setting using this method.
Hope this helps!
"Denny Voorhees" <
[email protected]> wrote in message
news:[email protected]...
> If I Recall correctly it should be around 1575, start there and tweek. Denny in Sayre, Pa "Bent
> but not broken" www.recumbentstuff.com "Glen Goldstein" <
[email protected]> wrote in
> message
news:BAFADFBC.8825%[email protected]...
> > Trying to set up my new cycle computer with my Tour Easy, and looking everywhere for the correct
> > setting (IN MILLIMETERS!) for the front
wheel,
> > which is a 20x 1/18. Yeah, I know the best way to do this is to do a rollout and measure it, but
> > I seem to have misplaced my millimeter tape measure! ;-)
> >
> > Anybody have the correct figure for this?
> >
> > many thanks,
> >
> > Glen
>
