Chain getting stuck between jockey wheel and mech cage

roubaixtom

Hi,

Recently my chain has been getting stuck between bottom jockey wheel and rear mech cage. Happens in most gear combinations.

Its a 105 5800 11 speed rear mech and the only thing i have noticed comparing to my other bikes is that the rear mech has play in it.

Anything else i should be looking for? why is this happening?

cheers
Tom

cougie

Have you changed the chain lately?

roubaixtom

yes, I have

cougie

Did you keep it the same length as the old ones?

roubaixtom

yes chain is the same length as the one on there before

cougie

Spring gone in the mech maybe? Have you done anything else to the bike?

roubaixtom

havent done anything else that would effect rear shifting.

Could it be the play at the mounting point pivot?

ridgerider

If its the bottom jockey gear its happen on, perhaps the chain is arriving at the mech at the wrong angle...is the rear mech aligned correctly? Does it happen in a particular gear combination?

cougie

And the rear mech screw is tight? So its not coming loose from the frame?

Maybe photos will help?

Bobbinogs

Might be also worth having a look at the jockey wheels. I seem to get through a set in about 12-18 months. If the teeth are worn and/or there is too much play in the wheel then that may be leading to the chain slipping off. If you are unsure then just disassemble/reassemble and see. Only takes a about 5-10 minutes and they seem to benefit from a clean/relube once in a while anyway.

The Rookie

Agreed, jockey wheel bearings are the number1 suspect.