Bicycle Mechanics - Pls help - chain catching in RD cage...

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Riles
05-11-06, 10:40 AM
the chain seems to be catching in the rear mech cage.

It happens much more in the smaller cogs and when I ride it feels like the chain is jumping - but it isn't changing cogs..

When I pedal with bike off ground to watch it - what happens is the chain seems to get caught for a second and the cage gets pulled forward a little - then it releases and hence it feels like the chain has jumped...

Anyone had this ? know what it is ?

I took the mech off my old bike & it worked fine on that -

the cable tension is set fine and the chain shifts fine - so it's not cable tension

Thanks..

powers2b
05-11-06, 11:06 AM
The RD wheels may be too close to the cogs.
There is a "B" screw that can be adjusted to prevent this.
You could have a stiff chain link.
Chain may be too long allowing RD wheels to fold back too far.

Enjoy
EricDJ
05-11-06, 01:16 PM
Ultegra RD and Shimano chain?

Riles
05-11-06, 11:53 PM
No, it's an MTB shimano XT RD with Sram chain...

sounds like it's one of the 3 possibilities mentioned by powers... will give that a go.

thks !
2372ighost
05-12-06, 05:28 AM
I had the same problem on a highbred, turning the chain real slow while watching every link pass over the rollers, I identified a stiff link.
Riles
05-12-06, 11:20 PM
Yup - stiff link it was... brand new chain as well...! thanks for the good advice.

Can I change the faulty link ? it's a Sram chain and I must admit I am having trouble using the chain tool to add links back in.

The tool is easy to use to take a link out, but when I try to add a link the pin doesn't click back like it does when it clicks out, so you have to see by eye when to stop pushing it through and always where I joined the link it is very stiff.

am I doing something wrong ?
2_i
05-13-06, 09:13 AM
Can I change the faulty link ? it's a Sram chain and I must admit I am having trouble using the chain tool to add links back in.

The tool is easy to use to take a link out, but when I try to add a link the pin doesn't click back like it does when it clicks out, so you have to see by eye when to stop pushing it through and always where I joined the link it is very stiff.

You should be able to losen the link with your hands by flexing the chain in the link area side-to-side. It is not a big deal. Just repeat it until the link gets reasonably loose.