Re: [CR]Thanet Eliptical / Oval? chainring question

(Example: Framebuilders:Cecil Behringer)

From: "Raoul Delmare" <R.Delmare@Charter.net>
To: "Classic Rendezvous" <Classicrendezvous@bikelist.org>
References: <00f301c29d66$1d624640$6501a8c0@mtlrel01.nj.comcast.net>
Subject: Re: [CR]Thanet Eliptical / Oval? chainring question
Date: Fri, 6 Dec 2002 14:49:55 -0600

Whoa !

Good advice !

Sorry that the fixed-gear portion didn't sink into my brain !

Good advice ! Warning ! Danger !

Raoul Delmare
Marysville Kansas


----- Original Message -----
From: The Maaslands
To: Classic Rendezvous
Sent: Friday, December 06, 2002 2:29 PM
Subject: I: [CR]Thanet Eliptical / Oval? chainring question



> Dan asked:
>
> > I'm expecting a 46 tooth Thanet eliptical chainring to be shipped soon for
> my Jack
> > Taylor fixed gear with a bolt circle that fits the Cyclotourist, Nervar,
> Stronglight arms
> > with the really tight bolt circle. My question is: How does the wide
> part orient itself
> > to the crankarm? I can have it perpedicular or in any of four other
> orientations. Its
> > enameled and I'd just as soon get it right the first time. Does anyone on
> the list have
> > experience with these? Hilary said that these were quite popular in the
> '30's and '40's.
> > I expect mostly for time trialing, but I'd like to know more.
>
> I don't have any direct experience with such chainrings but it strikes me as
> rather odd to put an elliptical chainring on a fixed gear. It would seem to
> me that this is an invitation to throw the chain. Perhaps the ellipse is
> small enough that the ideal chain length at the largest and smallest part of
> the ellipse do not vary sufficiently to allow for chain slack?! Personally,
> I wouldn't put anything other than a perfectly round and aligned chainring
> on a fix (or on the timing chain of a tandem) because of the possible dire
> consequences of a thrown chain.
>
> Hopefully somebody else has more immediate knowledge.
>
> Steven Maasland
> Moorestown, NJ
>
>
>
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