G
All,
I know that cassette wobble on bicycles is nothing new. It's not a
bent axle (seems like most like to blame that for starters). So, I ran
an experiment.
I had a set of wheels that had varying degrees of cassette wobble and
one that had none. I put them in the truing stand and spun the wheel,
while keeping the cassette mechanism (no actual gears) still, and
watched the wobble. I then took the best cassette mechanism and put it
on the worst wobbling wheel and the worst wobbling cassette mechanism
and put it on the best wheel. The result was the wobble followed the
rim and not the cassette mechanism. I even went as far as to switch
the steel washers around and rotated them to new positions to verify
that it's not the washers.
My question is does anyone know what is causing the hub to behave like
it's mis-aligned when mated to the cassette mechanism? Is it possible
that all hubs start out true and lose that truness when a wheel is
build and stress relieved (do the hubs bend slightly - road bike hubs
especially)? Is it possible that all hubs start out with varying
degrees of truness based on machining and thermal aging cycles? Any
other possibilities?
I know this is a don't care. It's more of a technical curiosity for
me.
Thanks,
GM
I know that cassette wobble on bicycles is nothing new. It's not a
bent axle (seems like most like to blame that for starters). So, I ran
an experiment.
I had a set of wheels that had varying degrees of cassette wobble and
one that had none. I put them in the truing stand and spun the wheel,
while keeping the cassette mechanism (no actual gears) still, and
watched the wobble. I then took the best cassette mechanism and put it
on the worst wobbling wheel and the worst wobbling cassette mechanism
and put it on the best wheel. The result was the wobble followed the
rim and not the cassette mechanism. I even went as far as to switch
the steel washers around and rotated them to new positions to verify
that it's not the washers.
My question is does anyone know what is causing the hub to behave like
it's mis-aligned when mated to the cassette mechanism? Is it possible
that all hubs start out true and lose that truness when a wheel is
build and stress relieved (do the hubs bend slightly - road bike hubs
especially)? Is it possible that all hubs start out with varying
degrees of truness based on machining and thermal aging cycles? Any
other possibilities?
I know this is a don't care. It's more of a technical curiosity for
me.
Thanks,
GM