Chain going beside rather than round lower jockey wheel - why / how fix?
Chain going beside rather than round lower jockey wheel - why / how fix?
My chain keeps coming off the lower jockey wheel and running through the cage beside it rather than on it.
I noticed this a few months ago and replaced the jockey wheel, which was very worn, and assumed that it would fix it. Maybe it did or maybe I didn't look closey. Either way, I notice the other day that it is happening again.
I went to the LBS and they suggested that I change the hanger. I did, but it is still happening. Within a couple of minutes of me putting the chain back on the jockey wheel it will have slipped off, especially if I shift a couple of times.
It's not clear what is going on. Nothing looks massively out of alignment but it must be or it wouldn't keep happening. The cage could have got bent, but I don't know how as I don't recall any incident.
I've ordered another set of new jockey wheels as simpler than messing around with the cage and maybe the ones I fitted have had issues - but not massively confident that they will fix it.
Any other thoughts / suggestions?
I noticed this a few months ago and replaced the jockey wheel, which was very worn, and assumed that it would fix it. Maybe it did or maybe I didn't look closey. Either way, I notice the other day that it is happening again.
I went to the LBS and they suggested that I change the hanger. I did, but it is still happening. Within a couple of minutes of me putting the chain back on the jockey wheel it will have slipped off, especially if I shift a couple of times.
It's not clear what is going on. Nothing looks massively out of alignment but it must be or it wouldn't keep happening. The cage could have got bent, but I don't know how as I don't recall any incident.
I've ordered another set of new jockey wheels as simpler than messing around with the cage and maybe the ones I fitted have had issues - but not massively confident that they will fix it.
Any other thoughts / suggestions?
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
Sounds like you're using the wrong chain for the rear mech, or the wrong rear mech for the chain.
There shouldn't be any room for the chain to come off the lower jockey wheel and it to run alongside.
There shouldn't be any room for the chain to come off the lower jockey wheel and it to run alongside.
Mick F. Cornwall
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
I had this on an Ultegra RD with an Ultegra chain that was definitely the right one. Caused by too much crud building up on chain and jockey wheel. I switched to lubing my chain with wax and PTFE in a slow cooker. Been perfect ever since. See:
https://youtu.be/953QTThT4_M and https://youtu.be/HHr9znwpwmQ
It's a bit of a faff but I only need to do it every 600 km - and everything stays clean.
https://youtu.be/953QTThT4_M and https://youtu.be/HHr9znwpwmQ
It's a bit of a faff but I only need to do it every 600 km - and everything stays clean.
Have we got time for another cuppa?
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
I still don't see that it's even possible to run a chain alongside the bottom jockey.
Mick F. Cornwall
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
Here's one of mine.
Difficult to photograph unless I get the bikes on the stand perhaps.
Tried to lift the chain off to put it to the side, and it won't go.
Difficult to photograph unless I get the bikes on the stand perhaps.
Tried to lift the chain off to put it to the side, and it won't go.
Mick F. Cornwall
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Re: Chain going beside rather than round lower jockey wheel - why / how fix?
Picture/s please, opMy chain keeps coming off the lower jockey wheel and running through the cage beside it rather than on it.
S
(on the look out for Armageddon, on board a Brompton nano & ever-changing Moultons)
(on the look out for Armageddon, on board a Brompton nano & ever-changing Moultons)
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
I have had this. A mix of a buggered mech, a stiff link and siezed jockey wheels which was the main thing. Should have checked a few things before riding a bike just dug out of a pile of bales.
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
You wouldn't think there was space for it to go to the side.
Here is the 'on' picture
But riding just a few yards with a few gear shifts, and it is back running alongside.
It's 11-speed chain and mech (Ultegra)
Here is the 'on' picture
But riding just a few yards with a few gear shifts, and it is back running alongside.
It's 11-speed chain and mech (Ultegra)
Last edited by frank9755 on 30 Jul 2021, 4:02pm, edited 2 times in total.
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
Can you get it to do this with the bike on a stand?
Jonathan
Jonathan
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
I,m sure the lower jockey is different from the upper in that it has some sideways movement,probably to accomodate more extreme chain angles.Has your LBS put an upper one on by mistake or perhaps your original one was also an upper?
Last edited by cyclop on 30 Jul 2021, 4:29pm, edited 1 time in total.
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
mech looks slightly bent inwards towards the wheel at the bottom to me.
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
That's clever.
What model of Ultegra is it?
Jonathan
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
It might be the photo or my eyes but the derailleur cage looks to be slightly bent inwards toward the wheel? Does the chain alway fall onto the outside of the jockey wheel?
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
Its difficult to see but the hanger could be twisted slightly ie toe in. Best to check the alignment of the hanger before you look elsewhere.
this recent thread may help. viewtopic.php?f=5&t=146971&hilit=hanger
this recent thread may help. viewtopic.php?f=5&t=146971&hilit=hanger
At the last count:- Peugeot 531 pro, Dawes Discovery Tandem, Dawes Kingpin X3, Raleigh 20 stowaway, 1965 Moulton deluxe, Falcon K2 MTB dropped bar tourer, Rudge Bi frame folder, Longstaff trike conversion on a Giant XTC 840
Re: Chain going beside rather than round lower jockey wheel - why / how fix?
The hanger looks bent inwards and the derailleur cage is twisted. Check and straighten the hanger with an alignment tool. Drop the chain to the biggest cog and straighten the cage with a heavy duty shifting spanner, using the wheel as an alignment aid.