RPM has nothing to do with the SPA speedo setup. As far as using the
mile markers I always found that operating a stopwatch on a bike a
littlie difficult to do . Then you have to figure time & distance to get
speed & then figure the rolling circumference then convert to meteric
measurements .............
The SPA unit is real simple . One magnet that rotates at wheel speed .
It only needs to know the rolling circumfrence of the tire . Gearing or
rpm have no effect on calibration . This is real nice because you can
change tires & recalibrate the unit .
Eric H
> What ever happened to the old school of (MPH)?....
> you know ... on the freeway..mile marker to mile marker = 1
mile..
> do it 60 sec. = 60 MPH ... tack is at where it wants to be ...
within
> reason...
> Tire size and final gear will change RPM.....or did I miss the
question?
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