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Sram etap rear derailleur problem

Posted: Mon May 15, 2017 11:55 pm
by srammer
I have an etap set up that spends more time at the dealer than on the road. The chain continues to slip off the lower puley on the rear derailleur. It happens when riding on the small chainring, Bent hangar suspected, however has been discounted now. Any other thoughts?

Re: Sram etap rear derailleur problem

Posted: Tue May 16, 2017 12:31 pm
by Rudi
Bent frame?

Is this a new RD on an existing frame that is known to have no issues, or a new bike/RD combo?

Re: Sram etap rear derailleur problem

Posted: Tue May 16, 2017 12:31 pm
by Weenie

Re: Sram etap rear derailleur problem

Posted: Tue May 30, 2017 1:33 pm
by srammer
New bike with new etap.

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Re: Sram etap rear derailleur problem

Posted: Tue May 30, 2017 2:32 pm
by pdlpsher1
Check the bike's chainstay length and compare it to the recommended minimum length for eTap.


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Re: Sram etap rear derailleur problem

Posted: Tue May 30, 2017 4:25 pm
by sungod

Re: Sram etap rear derailleur problem

Posted: Wed Jan 17, 2018 11:43 pm
by ChickenLegs
Did you ever resolve this? I have the exact same problem when shifting up at the rear to 39-13/12/11, or shifting down at the front from 53-13/12/11 into 39-13/12/11, and it's driving me insane. My chainstays are 410mm, and eTap requires 405mm, so I don't think that's the problem in my case.

Re: Sram etap rear derailleur problem

Posted: Sat Jan 20, 2018 8:34 pm
by stormur
etap may require 430mm .... depnds from chainset, frame OLD and crank type ( 130/135 OLD, BB30/PF30 vs "long spindle cranks" ). Look at chart linked above... maybe you just think it's 410 ?

Re: Sram etap rear derailleur problem

Posted: Sat Jan 20, 2018 10:29 pm
by BdaGhisallo
stormur wrote:
Sat Jan 20, 2018 8:34 pm
etap may require 430mm .... depnds from chainset, frame OLD and crank type ( 130/135 OLD, BB30/PF30 vs "long spindle cranks" ). Look at chart linked above... maybe you just think it's 410 ?
430mm? I don't think there are too many road frames with chain stays that long these days.

Re: Sram etap rear derailleur problem

Posted: Sat Jan 20, 2018 10:29 pm
by Weenie

Re: Sram etap rear derailleur problem

Posted: Sat Jan 20, 2018 10:57 pm
by wingguy
But the limitation on chainstay length is listed under the 'front derailleur' section as cross chaining angle on the rings is the governing factor (hence why min length changes with the size of chainrings used). It shouldn't be a factor on the rear mech working properly. I'd be much more inclined to think that something is physically wrong with the derailleur cage and/or the chain is too long.