[Yak] Front derailleur and middle chain ring

[Gaku Ueda]

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!

Thanks,
-gaku


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.
>
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> Washington, DC  20037
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> "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.
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> ----- 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
> chainrings.
>
> 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
>
> http://bikexprt.com
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>
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