Re: [CR]RE: the other...chainring

(Example: Framebuilding:Technology)

Date: Thu, 18 Dec 2003 12:38:39 -0500
From: "Joe Bender-Zanoni" <joebz@optonline.net>
Subject: Re: [CR]RE: the other...chainring
To: Neill Currie <neill1234@yahoo.com>, classicrendezvous@bikelist.org
References: <20031218163335.63105.qmail@web14007.mail.yahoo.com>


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


----- Original Message -----
From: Neill Currie
To: classicrendezvous@bikelist.org
Sent: Thursday, December 18, 2003 11:33 AM
Subject: [CR]RE: the other...chainring



> 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.
>
> =====
> Neill Currie
> 595-B E. Deering Rd
> Deering
> Nh 03244
> tel: 603-529-6472
> ------------
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