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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: Derailleur rattling?
Date: Thu, 15 May 2025 09:09:16 -0500
Organization: Yellow Jersey, Ltd.
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On 5/15/2025 8:10 AM, Ted Heise wrote:
> On Wed, 14 May 2025 16:36:58 -0500,
>    Mark J cleary <mcleary08@comcast.net> wrote:
>>   On 5/14/2025 3:53 PM, Catrike Ryder wrote:
> 
>>> +1 to that last one. Making changes on the work stand is often
>>>     followed by a stop a mile or two out on the next ride to
>>>     get things right.
> 
> Yup.
> 
> 
>>   He test road it and it was silent. He was a happy guy. Really
>>   over not much because it only had slight rub. The middle and
>>   small rear should be a working gear.
> 
> Just a minor comment on that last bit.  On my tandem, the chain
> doesn't like the two smallest cogs when on the middle ring.
> Tracked this down to chainline, basically the chain comes into
> contact with the inner side of the big ring and feints at shifting
> to it.  According to my tandem dealer, there's no simple fix to
> this, so I just don't use those combinations.
> 

Right, bikes vary in that a lot.
It's affected by chain width, chainstay length, lateral 
crank position etc.

-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971