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Chain leaves rear roller

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jlfunder Offline
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Posts: 5
Joined: Dec 2012
Post: #1
Chain leaves rear roller
I have a SRAM APEX 9 speed system (2 chainrings) 3 years old that has worked well until I took it apart to clean it. I put on a new chain too. Now in high range/low gear (crossing over) the chain jumps off the distal derailleur wheel, causing me to have to get off and reposition it. It is clear that the angle of the chain going from the big wheel on the cluster to the big chainring is causing this. It seems like the guides on the sides of roller wheel should be close enough to prevent the chain from jumping off. Did I put it back together incorrectly? Is the chain too short ? All opinions welcome.


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Apr 12, 2013 06:04 AM
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painkiller Offline
Veteran Member

Peoria, IL. USA
Posts: 1,460
Joined: Mar 2011
Post: #2
RE: Chain leaves rear roller
pic to narrow. lets a side view of the whole chain around the cogs thru the pullys


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Apr 12, 2013 07:01 AM
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jlfunder Offline
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Posts: 5
Joined: Dec 2012
Post: #3
RE: Chain leaves rear roller
(Apr 12, 2013 07:01 AM)painkiller Wrote:  pic to narrow. lets a side view of the whole chain around the cogs thru the pullys

That's a really hard picture to get -very busy background. I will give it a try tonight. Here's the latest thought. There are two wheels (pulleys) on the derailleur cage, big and little. The SRAM documentation never shows them clearly but most pictures of the cage show the idler pulley (the wheel most distal to the hub) as equal or bigger than the guide pulley (close to hub). I currently have the small one in the idler position. Maybe I have them switched?
Apr 12, 2013 08:01 AM
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RBurrelli Offline
Senior Member


Posts: 184
Joined: Jul 2010
Post: #4
RE: Chain leaves rear roller
That is entirely possible. Can't tell from your picture but make sure that the chain is properly running through the derailleur. It wraps around your rear cassette and passes overtop of the top pulley gear and then around the back side of the lower gear.
Apr 12, 2013 11:09 AM
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FredS Offline
Senior Member

Pike co., Mo.
Posts: 133
Joined: Dec 2010
Post: #5
RE: Chain leaves rear roller
Not the best pic, but the chain should look like this if it is ran correctly


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Apr 12, 2013 01:57 PM
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torquecyclerepairs Offline
Member


Posts: 50
Joined: Apr 2013
Post: #6
RE: Chain leaves rear roller
Did you remove and refit the jockey wheels?

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Apr 13, 2013 11:04 AM
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