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motorcycle and car rims



do motorcycle and car rims really differ in diameter?
Only if they're a different size.

I read in a Dunlop website that "passenger car and motorcycle rims
actually differ in diameter."
It would be really interesting if you could go back and find where the
Dunlop folks said something like this and post the URL for us.

and so they discourage mounting 15" car tires on a 15" motorcycle
rim....and vice versa.
A 15" diameter is a 15" diameter, and I believe that in both cases
"rim diameter" refers to the diameter of the rim bead seat, so no,
that's the same.

It's all those OTHER differences that are the problem.

To begin with - how many car tires do you think are
designed to be used at angles significantly off the vertical?
(For that matter, which way do cars lean when turning
- and why? Now ask the same question for motorcycles.)
Well it's rubbish isn't it. 15" is 15".
The rear tyre on my current bike is wider and taller with a larger wheel
diameter than were the tyres on my '68 MG Midget...


I was just wondering because reverse trikes have the rear end of a
motorcycle and they use car tires at the rear.
Trikes of any sort do not operate like motorcycles, unless
they're something very special (like the Piaggio 250).

Bob M.
Because the tyre doesn't know where it is.