Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Tue Sep 27, 2016 11:42 pm
Recently the board software has been updated and there are some known bugs/failures:
- Avatars are currently not being displayed ✔ FIXED
- Tapatalk connection is currently broken ✔ FIXED
- Avatars cannot be uploaded ✔ FIXED

Please note that we will soon do some changes in WW board template design in case to get a fully mobile/desktop responsiveness board!
If you find more errors please post it here: http://weightweenies.starbike.com/forum/viewtopic.php?f=7&t=139062


All times are UTC+01:00





Post new topic  Reply to topic  [ 9 posts ] 
Author Message
PostPosted: Sun Mar 24, 2013 4:11 pm 
Offline

Joined: Mon Apr 19, 2010 10:33 pm
Posts: 167
Anyone have any issues with getting a Sram red RD to run on the small cog effectively. On my build it wants to click onto the next highest cog. Eeverything else is perfect. It doesn't skip but but does catch a tiny bit. The limit screw isn't the issue and the B screw is fine. It pretty much feels like the spring doesn't have enough tension to move it over that far.

When I first put the bike together it was a big issue so I put a thin spacer between the RD and frame. That helped but I am wondering if their is a better solution.


Top
   
Posted: Sun Mar 24, 2013 4:11 pm 


Top
   
 
PostPosted: Sun Mar 24, 2013 4:47 pm 
Offline

Joined: Fri Dec 24, 2010 9:37 pm
Posts: 936
Location: it's raining, it must be uk
if you completely remove cable tension does the rd sit in the correct position?

if it's never worked ok i'd be checking from scratch

for instance, is there a spacer on the cassette? is it superfluous or the wrong size?


Top
   
PostPosted: Sun Mar 24, 2013 5:06 pm 
Offline

Joined: Mon Apr 19, 2010 10:33 pm
Posts: 167
with no cable tension and the limit screw out all the way still no luck. the cassette is a shimano 10s on a shimano 10 speed only hub. No extraa spacers.


Top
   
PostPosted: Sun Mar 24, 2013 5:21 pm 
Offline

Joined: Sun Dec 19, 2010 3:57 pm
Posts: 259
Hi Styrrell,

It might be worth getting your rear hanger checked for alignment...

Lig.


Top
   
PostPosted: Sun Mar 24, 2013 8:54 pm 
Offline
Shop Wrench
User avatar

Joined: Sat Nov 29, 2008 6:15 am
Posts: 743
Location: Colorado
Very rarely I find I need to add a very small shim between the rd and hanger to alleviate this problem. I think this is a known issue on certain specialized bikes and it pops up every now and then on others. The shim basically alters the rd position to allow the return spring to have a higher tension in the highest cog. Its a bandaid fix that i dont particularly like, but certain wheel/frame/hanger/rd combos dont leave enough space between the 11t and the outside of the hanger to let anything else work. Before this, I would check hanger alignment. Also, make sure there isn't a large amount of paint between the frame and the hanger. I would carefully scrape it off with a razor if there is. The last thing to check, is to make sure the rear piece of housing is long enough with the sram rd. without a b-spring, the housing length, if too short can pull the rd back and away from the 11t which can amplify skipping.

_________________
"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius -- and a lot of courage -- to move in the opposite direction."


Top
   
PostPosted: Sun Mar 24, 2013 8:58 pm 
Offline

Joined: Mon Apr 19, 2010 10:33 pm
Posts: 167
Thanks all,
Yep checked the RD hanger and its a ti frame so no paint. I'll likely just add a shim, but was hoping their was a way of getting more tension out of the RD spring.


Top
   
PostPosted: Mon Mar 25, 2013 2:16 pm 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 2196
Location: Santa Cruz, California, USA
If you grab the der and pull it out (with cables removed and high limit screw backed off) does it track on the cog ok? Then it's the spring. If not, the der doesn't have enough outwards travel. If that's the problem you'd need a shim.

The spring is Ti so I'd be leery of bending it to get more preload.


Top
   
PostPosted: Mon Mar 25, 2013 3:17 pm 
Offline

Joined: Mon Apr 19, 2010 10:33 pm
Posts: 167
Yeah, when I push on it just a touch the noise goes away. It probably needs about 0.1 mm lthough it sounds worse in the stand that on the road.


Top
   
Posted: Mon Mar 25, 2013 3:17 pm 


Top
   
 
PostPosted: Tue Mar 26, 2013 3:37 pm 
Offline

Joined: Mon Sep 05, 2011 1:17 pm
Posts: 89
Location: Geneva, Switzerland
I think I recall seeing this problem with SRAM Red whereby when the head of the limit screw is fully loosened, the silver screw on the knuckle is not completely flush and touches the parallelogram. Just reducing the profile of that screw may be what you need. If you do not know what I mean let me know and I will post a pic tonight.

Also, this was a Zinn column (SRAM specific issue at the bottom) :

http://velonews.competitor.com/2011/12/bikes-and-tech/technical-faq/technical-faq-with-lennard-zinn-cyclometer-on-%E2%80%99cross-bike-removing-sealant-from-tubulars-shifting-on-a-roubaix_200728


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 9 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Help! Campagnolo Record 11 crank ghost shift in small-small combo

[ Go to page: 1 2 ]

in Road

Birdman

23

1051

Thu Jul 21, 2016 5:37 pm

Calnago View the latest post

There are no new unread posts for this topic. Attachment(s) Spacers with small outer diameter?

[ Go to page: 1 2 3 ]

in Road

cdtf

39

1787

Thu Feb 25, 2016 3:52 pm

cdtf View the latest post

There are no new unread posts for this topic. Small chip on my carbon wheel help please??

in Road

Allen254

5

431

Wed Jul 27, 2016 6:20 pm

Allen254 View the latest post

There are no new unread posts for this topic. 0 degree (or small setback) gloss finishing kit

in Road

micro553

1

116

Mon Sep 19, 2016 9:19 am

sawyer View the latest post

There are no new unread posts for this topic. Shifting into the small chainring throws off chain at RD

[ Go to page: 1 2 3 ]

in Road

istigatrice

35

1736

Tue Oct 13, 2015 1:09 pm

bikerjulio View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: 53cxzero, Google [Bot], McGilli and 25 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:  
Powered by phpBB® Forum Software © phpBB Limited