2 hangers in 2 rides...

concorde

Snapped a hanger last Thursday. Bike rode fine on the Tuesday, then rode on the Thursday and had to cut the ride short as gears were slipping and chain was coming off at the back on the biggest cog when climbing. One of the boys had a look and said my jockey wheel is really worn and the chain is sticking between the jockey wheel and the metal bit. Causing the mech to pull forward and chain come off.

Got home to find hanger was snapped. So I thought I'll change the hanger, that is what must have been causing it as it must have been bent. Changed it, rode it up and down lane and it seemed fine. Brother went out on it last night and it snapped in half again when he was riding up a hill. He said the chain came off once before this but couldn't tell me where it came off (i.e. biggest cog at back etc) as he is clueless.

So now I am thinking it could be the jockey wheel again but I've asked a few people and they've said jockey wheels can be worn beyond belief and cause no bother.

Thinking I may probably be better off just buying a new rear mech. SLX medium cage clutch mech instead of the long cage SLX I have now. And drop the big ring at the front...

Doing my head in!

I've been through 4 hangers in the last 8 months!

Chunkers1980

Sounds like a setup issue.

nicklouse

chain suck.

concorde

Chunkers1980 wrote:

Sounds like a setup issue.

Care to expand...?

concorde

nicklouse wrote:

chain suck.

I don't think it is chain suck, when it was happening last Thursday me and a mate had a look at it and the only ting we could see happening was the chain being jammed between bottom jockey wheel and the cage bit of the bottom of the mech. The bottom jockey wheel had loads of lateral movement, don't think that is the norm is it?

nicklouse

you say the mech is being pulled forward.

if it was jamming in the cage it would be pulled backwards. the only way for it to be pulled forward is chain suck.

concorde

nicklouse wrote:

you say the mech is being pulled forward.

if it was jamming in the cage it would be pulled backwards. the only way for it to be pulled forward is chain suck.

Ah right, I see. I've confused myself now... :roll:

When I was backpedaling the derailleur was being pulled towards the front of the bike. Just txt the mate who I was with to see if it was being pulled backwards or forwards when pedaling normally!??!

nicklouse

Concorde wrote:

nicklouse wrote:

you say the mech is being pulled forward.

if it was jamming in the cage it would be pulled backwards. the only way for it to be pulled forward is chain suck.

Ah right, I see. I've confused myself now... :roll:

When I was backpedaling the derailleur was being pulled towards the front of the bike. Just txt the mate who I was with to see if it was being pulled backwards or forwards when pedaling normally!??!

then maybe a stiff link in the chain.

concorde

nicklouse wrote:

Concorde wrote:

nicklouse wrote:

you say the mech is being pulled forward.

if it was jamming in the cage it would be pulled backwards. the only way for it to be pulled forward is chain suck.

Ah right, I see. I've confused myself now... :roll:

When I was backpedaling the derailleur was being pulled towards the front of the bike. Just txt the mate who I was with to see if it was being pulled backwards or forwards when pedaling normally!??!

then maybe a stiff link in the chain.

Will take a look when I get back home. Looks like it could be any number of things! Great! :roll:

nicklouse

I would not suspect the rear mech. i would not suspect the jockey wheels.

front rings and chain.

concorde

nicklouse wrote:

I would not suspect the rear mech. i would not suspect the jockey wheels.

front rings and chain.

Starting to think that myself. I will take a closer look tonight, I'll borrow a chain wear device thingy and check for any stiff links. Will also check the chain rings for wear.

Cheers

concorde

My mate says he's pretty sure it was pulling the mech backwards not forwards. Would make sense I suppose as if ti was pulling forwards this would not cause the chain to come off of the top rear cog. The derailleur pulling backwards is more likely to have this effect... (I think!)

nicklouse

most likey a stiff link then.

concorde

nicklouse wrote:

most likey a stiff link then.

Appreciate the help Nicklouse. Will take a look when I get home from work.

Maro

I would have said maybe a stiff link, or perhaps the indexing is out and the low stop needs a tweak.

concorde

Chain is fine. No stiff links. Think I've found the issue. Bottom jockey wheel has metal either side, it was all bent which is what chain was jamming in-between, that and the jockey wheel. After yesterdays snap some of the metal has actually snapped off. I think a mixture of the metal at the bottom being bent and the cage being slightly bent meant the chain was jamming. I'll order a new rear mech, just tried and the medium cage clutch SLX mech I want is now sold out! Not amused!!!

Some pictures below, front chainrings look a bit worn to me too.

concorde

http://i977.photobucket.com/albums/ae255/rodduz/IMAG0086.jpg

http://i977.photobucket.com/albums/ae25 ... AG0087.jpg

http://i977.photobucket.com/albums/ae25 ... AG0090.jpg

http://i977.photobucket.com/albums/ae25 ... AG0091.jpg

http://i977.photobucket.com/albums/ae25 ... AG0092.jpg

Video...

https://www.youtube.com/watch?v=uYDacCA ... e=youtu.be

https://www.youtube.com/watch?v=dtU0TMn ... e=youtu.be

nicklouse

replace the cage and it will be fine.

concorde

nicklouse wrote:

replace the cage and it will be fine.

Ah right, didn't know I could just replace the cage. Will get Googling.

Cheers

concorde

Doesn't look very easy to buy cages on their own. Part 10 I need off this diagram I think.

concorde

This is getting beyond a joke now! Is there any other common issues that cause mech hangers to snap? I bought a new one for North Wales last weekend just in case one snapped on me, well it did!

Rode CyB on Saturday, fine, towards the end gear changes were a bit rubbish, couldn't select biggest cog at the back. Thought nothing of it. Next day wrote Degla, three miles in, nearly at top of initial climb, snap! Mech through spokes, snapping cable! Replacement mech of no use as had no cable. Rode single speed. Was okay at the start then kept going on to bigger cog than I wanted, meaning chain was too tight and could barely turn the cranks!

I've noticed that the rides it goes on is usually the ride after gear changes get a bit dodgy. I tell myself to check it before going out again, but I never do!

But still, any other things I can check that may be causing this?

I've been through 6/7 in the last 9 months!

Cheers

The Rookie

I'd replace the chain and mech complete, one or the other is doing it!

nicklouse

Concorde wrote:

I've noticed that the rides it goes on is usually the ride after gear changes get a bit dodgy. I tell myself to check it before going out again, but I never do!

so what is causing the gears to go dodgy?

that will be your problem.

if you dont check then things like hangers going will happen.

The Rookie

I read it as the Hanger starting to flex, but with hindsight could be wrong.....

concorde

I've replaced the mech and same thing has happened. I will be getting a medium cage mech shortly and I'll shorten the chain down for that at the same time. Or would I be better off getting a new chain at the same time?

No idea what causes the dodgy gear changes, it's ok all ride then I couldn't select the top cog. On inspection before I rode the next day I noticed the top jockey wheel was touching the cog so I adjusted the barrel adjuster and this fixed the problem. (The jockey wheel was not touching the cog at the beginning of the ride on the start of the ride Saturday but by the end of it, it was?!)

cooldad

The b screw sets the distance from the cassette, the barrel adjuster adjusts the cable tension. Nothing to do with each other.
You need to read Parktools and adjust things properly.

cooldad

Adjusting the barrel adjuster, as in your previous post, without the low limit screw being set correctly will be what sends your mech into the spokes.

concorde

That's what I meant, I adjusted the B screw not the barrel adjuster. And the limit screws were set correctly before doing this.

The Rookie

The upper jockey location is a combination of factors, b-screw preload on the upper spring, and then the upper spring 'fighting' the lower spring, if something 'changes' it's still possible for the jockey to hit the lowest gear (biggest - top cog is the smallest, assume you meant biggest/first and not top?)

Chunkers1980

That's for a normal style mech. Shadow mechs don't use a spring, it just pivots.

*AJ*

First observation is that the bike doesn't look particularly well maintained in the pictures? theres A LOT of built up crud there! built up crud causes issues.