Rear Mech - Chain Catching

gareth.cantrill

Now this may seem like a stupid question but: Are the jockey wheels on on XT rear mech slightly different in terms of size?

I took my chain off last weekend to clean it and thought I'll take my jockey wheels off at the same time for the same reason. I've put them back on and the chain and now the chain seems to catch the hanger between the jockey wheels. Its only just catching but the resulting noise is pretty annoying.

I cant say I noticed the noise before I cleaned it and I'm pretty sure it shouldnt be doing it. The bit its catching is the lip in the middle of the hanger, it looks like a guide.

Any help would be appreciated. I have lubed the chain.

peter413

Have you put it the right side of the little tab?

And I think the jockey wheels are different sizes, yes

gareth.cantrill

Yeah yeah, its the right side.

But I didnt note which wheel i removed from where, so if they are different sizes then that is probably it. It seems like the most obvious solution.

Thanks for the reply, I will take it apart again tomorrow and switch them around.

supersonic

The floating wheel goes at the top.

nicklouse

and the is the "G pulley".

it says so on the side.

gareth.cantrill

No joy.

The jockey wheels are fine, and i've taken it to bits and put it back together.

Could it be that my chain is too long? I'm sure the chain should pass between the jockeys without coming into contact with anything else.

It's doing my head in and I;m starting to think its always been like it. That could be the Formby Cycles build or lack of build. £1500 on a bike that clearly hadnt been set up at all.

nicklouse

pics and make sure the chain misses the tab.

gareth.cantrill

I'm struggling to upload any pics, and I'm really struggling to figure out how to make the chain miss the tab. It must have been doing it all along and I only removed the chain and jockey wheels to clean them. I dont see how its taking such a close route along the hanger. Any adjustment to the derailleur makes no difference. It continues to run right along the hanger between the jockey wheels.

cooldad

You do have the chain on the outside of the tab, don't you?

gareth.cantrill

Yeah I do. It running smoothly enough but because of the slight catch its makign a racket.

gareth.cantrill

Actually. No I dont. What a clown. I thought I had, I thought the lid was a guide and that looked like the obvious route for the chain. I've now looked at my maintenance book and I have it routed the wrong side.

Sorry for being a time wasting muppet. You live and learn though I suppose.

supersonic

Hehe, many make this mistake, I did it myself not long ago! And I have fit 100s of chains!

cooldad

No worries, next time someone asks the same thing (and it won't be long), you too can sound all clever and superior.

Anonymous

Especially when they check, and keep repeating that they haven't done it wrong

nicklouse

yeehaamcgee wrote:

Especially when they check, and keep repeating that they haven't done it wrong

so it one every 5 days
http://www.bikeradar.com/forum/viewtopic.php?t=12721862

cooldad

How about a pool on the next one. I'll take 4 days. Winner gets some nothing.