Re: [CR] Stronglight 105 Inner + 93 Outer on 93 Crank

(Example: Framebuilders:Tony Beek)

Date: Wed, 23 Sep 2009 22:47:07 -0700
From: "verktyg" <verktyg@aol.com>
To: paul grens <pgrens@yahoo.com>, <Classicrendezvous@bikelist.org>, <Verktyg@aol.com>
References: <849041.22064.qm@web30007.mail.mud.yahoo.com>
In-Reply-To: <849041.22064.qm@web30007.mail.mud.yahoo.com>
Subject: Re: [CR] Stronglight 105 Inner + 93 Outer on 93 Crank


Paul,

I've been ridding Stronglight cranks since 1975. I remember seeing that problem with old steel chain rings on occasion and on a TA double set up on one my bikes but I don't recall having any problems like that with my Stronglight cranks.

I have 6 or so bikes with Stronglight 93 or 105 cranks plus one with a 99 triple. I've been running SRAM PC-48, PC-58 or PC-68 6-7-8 speed chains on them and at least one has a newer SRAM PC-850 chain.

It seems that it would be more likely to happen when the chain is on the middle rear cog. When the chain is on an outer or inner rear cog, the chain is running at an angle and might be less likely to fall between the chain rings???

Chas. Colerich Oakland, CA USA

paul grens wrote:
> Hey all,
>
> Well, this is more of an emergency/daily rider solution. I've only had two sets of Stronglight 93s (both with original rings), one with a 42/52 combo that worked perfectly with a Shimano HG chain, however, the other, a 45/52 (I think), with its original Sedis chain, flopped happily right between the rings each time I shifted. Upon further inspection, it appeared that the chain had gotten caught in between in the past and someone had kept on riding with the chain like that (the grooves from the chain pins were deep and ugly between the rings) and it had bent them so bad that the rings had cupped outward. The smaller 42t ring seemed to have taken the worst of it so I just flipped it over and put it on backwards. Of course, not the best solution since I lost the luxury of the recess for the chainring bolts, but the problem was solved and it shifted and performed fine after that.
>
> I wonder if this problem is related to the chainring sizes being closer to one another?
>
> Cheers,
>
> Paul Grens
> Chicago, IL, U.S.A.