Stewart Warner speedometer.

Quoted message said:

My speedo which as I recall used to be dead on the money
when it was on my English bike, is indicating that we
traveled farther than his GPS indicates. Is this due to
the fact that my present wheel is slightly larger than
the original?

A larger wheel will cause the speedo to read less distance travelled,
not more, because it turns fewer revolutions over the given distance.

--
"Bicycling is a healthy and manly pursuit with much
to recommend it, and, unlike other foolish crazes,
it has not died out." -- The Daily Telegraph (1877)

On Tue, 07 Sep 2004 23:39:09 -0700, LioNiNoiL_a t_Y a h 0 0_d 0 t_c 0

m said:

Quoted message said:

My speedo which as I recall used to be dead on the money
when it was on my English bike, is indicating that we
traveled farther than his GPS indicates. Is this due to
the fact that my present wheel is slightly larger than
the original?

A larger wheel will cause the speedo to read less distance travelled,
not more, because it turns fewer revolutions over the given distance.

And the SW may be closer than the GPS in terms of distance that the
wheel rotated through. A GPS produces its results via point-to-point
displacement calculation over the smallest granularity of measurement
space it supports, ignoring squiggles in the path between them; the
speedo sees just the wheel rotations, and ignores direction. The
result will often be different. I don't have a gps, but on the few
occasions that I've ridden with someone who did, its distance
measurement only agreed with speedos closely when the path was
relatively straight.

--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.