I'll argue against Peter's position too.
When I had a single Sugino Maxy chainwheel on my cyclocross bike I would warp it all the time. The ring was then straightened, warped etc. Chain tension can get pretty high ( 2-300 lbs?) and deflect a ring, either as a result of lateral forces or maybe even column loading. In that case a soft, thin single alloy ring wasn't quite up to the task.
Joe Bender-Zanoni
Great Notch, NJ
> Peter wrote:
> "Any deflection you see in chainrings is from flexing
> of the seat tube
> between the front derailleur and the BB shell, and
> flexing of the
> bottom
> bracket axle. There are no lateral forces on
> chainrings, except during
> shifts."
> ================
> Well, basically an OK assumption, providing the
> chainline is perfectly straight. If it isn't (and it
> isn't most of the time on any bike with several cogs
> on the back), then there usually varying amounts of
> lateral force applied to the rings.
> Whether this is discernable, or even has any practical
> implication, I have not a clue.
>
> Neill "Pedantique" Currie
> Deering, Nh.
>
> =====
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> 595-B E. Deering Rd
> Deering
> Nh 03244
> tel: 603-529-6472
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