HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 8 posts ] 
Author Message
PostPosted: Mon Dec 03, 2012 8:43 pm 
Offline

Joined: Fri Jul 09, 2010 9:24 pm
Posts: 80
My apologies but i couldn't figure out how to post photos on my computer so I'm starting a new thread on this with photos through tapatalk.

Just to recap - I discovered my rear derailleur was throwing my chain off the pulley. It's ground down the lower pulley teeth and chewed a groove in the cage. The derailleur was new with a group from February 2012. It was on my 2010 supersix for 5 months then on my Evo for 4 months. Both frames, it turns out, have loose der hangers. This seems too unlikely a coincidence and I think it must be the derailleur.

I'm going to ask sram to warranty it but would still really appreciate input.
Attachment:
ImageUploadedByTapatalk1354563772.509589.jpg
ImageUploadedByTapatalk1354563772.509589.jpg [ 73.16 KiB | Viewed 1739 times ]


Top
 Profile  
 
Posted: Mon Dec 03, 2012 8:43 pm 


Top
  
 
PostPosted: Mon Dec 03, 2012 8:55 pm 
Offline
User avatar

Joined: Thu May 04, 2006 4:43 pm
Posts: 4992
Location: Wherever there's a mountain beckoning to be climbed
I'm not saying this is the cause or a contributor, but you might want to clean your chain and pulley wheel teeth (and probably your cassette teeth and ...).


Top
 Profile  
 
PostPosted: Mon Dec 03, 2012 9:11 pm 
Offline

Joined: Fri Jul 09, 2010 9:24 pm
Posts: 80
The chain was brand new 4 days ago, and the derailleur was cleaned like new - you're just seeing the junk I picked up after riding the last 3 days in Central Park here in NYC where the weather has been nice but the park is still pretty messy after the Sandy storm.

The other photo I posted didn't show up, but you can tell from this one how ground down the teeth on the lower pulley are, especially compared to the upper pulley. And the groove I mentioned on the cage is above and to the right of the pulley bolt in this photo - it's immediately next to the pulley on the wheel side and you can see where it catches the light.


Top
 Profile  
 
PostPosted: Mon Dec 03, 2012 11:08 pm 
Offline

Joined: Thu Nov 17, 2011 4:29 pm
Posts: 138
Pulley bolt doesnt look like its through properly, you can normally see the end of the bolt flush on the other side. That will allow too big a gap between side plates and chain can run between plate and pulley, wearing teath and plate

Be aware the top and bottom pulley bolts are NOT the same length or size and if they were swapped round this could be the result

The red cage seems very sensitive to bolt tension and spacing of all, when I swapped out my side plates for carbon ones, the pulleys for KCNCs and the bolts for lighter ones I had lots of issues and noise till I got it all just so

_________________
Cervelo S3 2011. Blinged 6.718 Kg


Top
 Profile  
 
PostPosted: Tue Dec 04, 2012 1:58 am 
Offline

Joined: Fri Jul 09, 2010 9:24 pm
Posts: 80
Thanks madmole, but I'm pretty sure the pulley bolts haven't been touched, and I bought the derailleur new. I just pointed the problem out to my mechanic last week and he would have had no reason to fiddle with the pulley bolts before that (and I hadn't touched them). I did just check the pulley bolts and they both are snug, so if there is some problem with the length or a mixup between upper and lower pulley bolts then it would have to have happened at Sram.


Top
 Profile  
 
PostPosted: Tue Dec 04, 2012 1:27 pm 
Offline

Joined: Tue Dec 23, 2008 2:57 pm
Posts: 620
Location: NYC
Why are you starting a whole new thread on the same issue???

viewtopic.php?f=3&t=109873

There are already plenty of responses to this issue in your previous thread? Have you confirmed with a reliable and capable mechanic that the suggestions others already made were actually engaged by your "mechanic"?

EM3

_________________
______________

My 2013 Cervelo R5


Top
 Profile  
 
PostPosted: Tue Dec 04, 2012 4:24 pm 
Offline

Joined: Fri Jul 09, 2010 9:24 pm
Posts: 80
I started a new thread because my computer skills are at a 3rd grade level and I couldn't figure out how to post a photo (which Rick had requested) and I had to do it through Tapatalk.

Ive been trying to get as many ideas and as much input as possible because my mechanic who i bought the derailleur from said that he thought it must have been a problem related to my derailleur hangers (on both frames) and that the only reason Sram would warranty the derailleur is just to be nice - I wanted to be able to make a better case than to just plead for Sram's sympathy.

Today I'm going to talk to my mechanic and let him know that others have had similar problems with Sram rear derailleurs, which lead to a replacement.


Top
 Profile  
 
Posted: Tue Dec 04, 2012 4:24 pm 


Top
  
 
PostPosted: Tue Dec 04, 2012 11:03 pm 
Offline

Joined: Mon Jun 14, 2010 2:32 am
Posts: 91
I've had something similar happen about 2 months after I installed my new Red group. There was no damage to the pulley but it looked like the inside of the cage was delaminating pretty severely almost as if the chain was cutting into it. I wish I saved the picture that I sent to Sram so I could post it. I never figured out the cause being there was no mechanical issues with the bike whatsoever and Sram did warranty it in my case. I'd recommend just having your mechanic call Sram and explain what's going on, however if the hanger was loose (which they will likely ask as one of the determining questions) you may be out of luck.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 8 posts ] 


Who is online

Users browsing this forum: eric01, genesis692, Google [Bot], LabRatMatt, spdntrxi, Yahoo [Bot], zedi and 51 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Possible to fix this Sram Red rear derailleur?

in Road

micky

2

713

Sun Aug 11, 2013 9:24 pm

micky View the latest post

There are no new unread posts for this topic. Sram rear derailleur issues

[ Go to page: 1, 2 ]

in Road

boolinwall

20

1776

Mon May 27, 2013 1:22 am

boolinwall View the latest post

There are no new unread posts for this topic. Prototype SRAM Red Rear Derailleur?

in Road

caadmium

6

1195

Sat Nov 02, 2013 8:16 pm

caadmium View the latest post

There are no new unread posts for this topic. Help: how to replace SRAM Red rear derailleur spring...

in Road

bikebetty

8

897

Sun Jul 21, 2013 3:03 pm

bikebetty View the latest post

There are no new unread posts for this topic. SRAM Red Rear Derailleur Tuning with Fibre-Lyte

[ Go to page: 1, 2 ]

in Road

drainyoo

23

983

Sat Feb 01, 2014 12:04 am

drainyoo View the latest post


cron
It is currently Thu Apr 17, 2014 5:05 am

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB