[richiedelf]

Hi, I've had my Sunday for ages now, and have always had a massive problem with the chain slap against the rear triangle. I just cover the thing in old inner tube and get on with life. But I would, one day maybe like to solve the issue. Does anyone have the same problem, or know how to fix it? It's a short cage XO and a 36 tooth chain ring, run from a Raceface Atlas crank. The frame's a 2008 small.
Thanks!!!!!

 

[jonKranked]

have you tried shortening the chain?

 

[richiedelf]

Yeah, took so many links out once, that it stopped it going through all its travel...

 

[jonKranked]

how old is the derailler? i've had issues before using super old deraillers where the springs no longer had enough tension to keep the chain from flopping around like 80 year old titties

 

[jonKranked]

also, try dialing in the b-screw

 

[yd35]

New Shimano stuff with the clutch?

 

[richiedelf]

how old is the derailler? i've had issues before using super old deraillers where the springs no longer had enough tension to keep the chain from flopping around like 80 year old titties

Is that the spring in the derailler, or the spring in the cage? The cage was new when I built the bike.

 

[ptd]

I've found when the chain is over shortened the noise increases greatly, when the length is one or two links on the long side rather than short, the noise decreases. B adjuster works if the der. is hitting frame in high gear, otherwise can make it worse if over done.
When I went from lg1 to SRS the noise also increased.
When I flick the der. cage, currently x9, the hanger stop rotates and flings back, also creating noise.
Noise decreased when I rotated the chain device to move the bottom guide away from the chainstay, because when the der. flicks it whips the chain up hitting the underside chainstay and making a huge noise.

I'd like to try new saint with clutch and rubber stopper, with not too tight chain, probably the only solution.

 

[Mr Lahey]

If you have an LG1 you can try gluing the plastic portion of velcro to the insides of the upper chain guide. I always found the chain slapping against the chain guide to be the loudest part of my bike.

 

[jonKranked]

Is that the spring in the derailler, or the spring in the cage? The cage was new when I built the bike.

probably the one in the cage, but it could be both. if its a few years old and has seen a lot of use, this may be the culprit. if you have a newer derailler (spare, on another bike) it'd be a quick & easy way to determine whether or not this was the culprit

 

[Udi]

They're usually fairly quiet with a sram mech, I'd be comparing the movements of your X0 to a friend's if possible. I've seen them break internally on the fixed pivot that attaches to the frame so they can flop around there, or like jonKranked said, one of the springs.

Assuming that's sorted though, it helps to run the silicone tubing over the cable housing like the WC bikes, and the latest thick adhesive rubber tape everyone is using works really well (better than velcro). I use a strip along the top of the chainstay (under the tube covered housing) and a strip underneath the chainstay. It helps to run the tape all the way to the chainring on both top and bottom.

I forget what it's called but it's a 3M product about 2.5mm thick on brown backing paper, maybe someone else can name it.

 

[ptd]

Mastic tape 2228 cool stuff!
http://www.Shop3M.com/80610322945.html?WT.mc_ev=clickthrough&WT.mc_id=shop3m-AtoZ-Scotch-Rubber-Mastic-Tape
http://www.3mselect.co.uk/p-1551-rubber-mastic-tape-scotch-2228-50mm-x-303m-1-roll.aspx

 

[richiedelf]

Thanks for all the help, but it's not really about it being noisy or not.... More about the state of the rear triangle. Kinda looks like it's been attacked by a small angle grinder around the chain and damages the gear cable outer too.

 

[ptd]

Same advice I'd say....
- lg1 style guide will reduce chain slapping the top of the stay
- moving lower guide away from stay a bit will reduce chain slapping the bottom of the stay
- over shortened chain makes slap worse
- clutch derailler should reduce slap
To reduce noise when it does happen....
- mastic tape
- tube over cable
- rubber bumper on derailler

A few chainless runs on my Sunday was so quiet in comparison, I've been tinkering ever since...