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From: Zen Cycle <funkmaster@hotmail.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Derailleur rattling?
Date: Wed, 14 May 2025 15:50:59 -0400
Organization: A noiseless patient Spider
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On 5/14/2025 3:35 PM, AMuzi wrote:
> On 5/14/2025 1:47 PM, Mark J cleary wrote:
>> Guy brings me a bike to check out. A Specialized Sirrus from about 
>> 2014 8 speed DT. Says the derailleur was rattling and shifting on its 
>> own at times. I put in on the stand and it seemed to shift ok really/ 
>> He need the back wheel trued also and was really a wobble.
>>
>> I ask him if he did anything and he said he did go home and clean and 
>> lubed the chain. The chain look pretty clean too. So I managed to get 
>> the wheel trued and it is pretty decent not like truing a precise road 
>> machine with expensive wheels but it is fine.
>>
>> I then cleaned the chain good again and adjust the back V brakes. Was 
>> a bit off but now they are even on both side. I lubed some point of 
>> contact in the brakes at the frame and then clean the rear derailleur. 
>> I then drop some lube at the pivots on the RD.
>>
>> I made absolutely no adjustment to the RD. I did make a very small FD 
>> adjustment to take out some rub on the big cog in front in the middle 
>> ring when in the small rear.
>>
>> Right now on the stand the bike shifts perfectly in all combinations 
>> and quite good I might add. So do you think what this guts problem was 
>> all along a dirty non-lubed chain? I know if things not lubed it will 
>> shift funny is ghost shifting a product of dry chain? In the end ghost 
>> shifting suggest to me much more problems but frankly I had this back 
>> working in 20 minutes.
> 
> V brakes do not move on the frame post. The pivot is inside the arm. 
> Some models can be lubricated easily and some cannot.
> 
> Did you check that the cassette sprockets are tight on the body? A loose 
> cassette lockring will give randomly sloppy shifts.

yup, that's bitten me as well. Usually that shows up on the stand.

> 
> Is the rear changer straight? Get your head behind it and sight the 
> chainrings.  A vertical line through the pulleys should match one 
> through the chainrings.
> 
> Did you ride it?  There are some things which are not obvious in mid air.
> 


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