[Yak] Front derailleur and middle chain ring
gaku-yak at gaku.net
Thu Aug 28 18:42:23 CDT 2008
Thanks for advises. I am encouraged to work on the issue!
I've checked the chainrings and it was Shimano's 52-42-30. It says "SG".
I've ordered a front deraileurs so that I can compare it with the
front derailleur I have. I've checked the derailleur mount too. It
looks okay to me, though I'm not 100% sure. Is there a way to tell
that the mount is at correct angle?
The part is arriving next week, and I'll report my second attempt!
On Tue, Aug 26, 2008 at 8:24 PM, Geof Gee <geoffreygee at yahoo.com> wrote:
> I can never tell much from these photos. Unfortunately, what I wrote precisely escapes me -- a mind is a terrible thing to lose -- but I would only seriously check for a bent derailer if the chainrings were a non-standard Shimano combination. I guess one should also be careful since the different Shimano groups sometimes have different jumps between the big and middle chainring. I recall that a few years ago, most cranks were 52/42/30 whereas the latest models use a 39 in the middle. The 105 triple uses a 50t big chainring.
> Washington, DC 20037
> "Growing up is a terribly hard thing to do. It is much easier to skip it and go from one childhood to another." F.S.F.
> ----- Original Message ----
> From: John S. Allen <jsallen at bikexprt.com>
> To: Geof Gee <geoffreygee at yahoo.com>; Gaku Ueda <gaku-yak at gaku.net>; yak at bikefriday.com
> Sent: Tuesday, August 26, 2008 12:13:27 PM
> Subject: Re: [Yak] Front derailleur and middle chain ring
> At 10:45 PM 8/25/2008, Geof Gee wrote:
>>Assuming that the upper part of the cage is parallel to the
>>chainrings and the outer ring is vertically parallel to the outer
>>cage, it sounds like your derailer is bent. You can bend it back
>>into the proper shape.
>>Note that it is possible that the derailer mount and cage are
>>bent. I recall a post from Tim Link -- BF Mechanic -- that had a
>>suggestion on how to bend the mount back into proper alignment.
> I don't see any evidence that the cage is bent, though it might
> possibly be. But clearly, the lower cage plate extends down too far
> to work with the tooth number difference between the outer and middle
> John S. Allen
> Regional Director for New York and New England, League of American Bicyclists
> League Cycling Instructor #77-C and Member of the League's Education Committee
> Yak mailing list
> Yak at bikefriday.com
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