Sujet : Re: Derailleur rattling?
De : mcleary08 (at) *nospam* comcast.net (Mark J cleary)
Groupes : rec.bicycles.techDate : 14. May 2025, 22:36:58
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <10032dn$2n1r1$1@dont-email.me>
References : 1 2 3
User-Agent : Mozilla Thunderbird
On 5/14/2025 3:53 PM, Catrike Ryder wrote:
On Wed, 14 May 2025 14:35:43 -0500, AMuzi <am@yellowjersey.org> 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.
>
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.
+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.
--
C'est bon
Soloman
Well the fellow came by and he road the bike. Shifted fine but he had a small rattle against the FD cage when in the middle front ring and smallest cog. I road could here it. The fix which worked and noise was to move the FR hanger so the cog was parallel with ring, plus a small bit of fudge factor move out.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. Funny thing was the small front and the small rear did not rub as the cage gets slight wider down at the end. The small about 1mm move I made was the difference.-- Deacon Mark
Derailleur rattling?
Re: Derailleur rattling?
