Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Fri Mar 31, 2017 1:29 am

All times are UTC+01:00





Post new topic  Reply to topic  [ 15 posts ] 
Author Message
PostPosted: Sun Nov 11, 2007 1:33 pm 
Offline

Joined: Sun Nov 28, 2004 1:53 am
Posts: 397
Location: Darmstadt - Germany
Hi guys,

i spend a few hours in the workshop.

I tuned my Rival rear der. to 15th lower pulley.
Weigh is at 170g. Still light.
http://picasaweb.google.com/dark.albert ... sumbauSram


dark_albert


Top
   
 Post subject:
PostPosted: Sun Nov 11, 2007 4:09 pm 
Offline
User avatar

Joined: Tue May 02, 2006 12:24 pm
Posts: 592
Location: Prague
what for?

_________________
Ellsworth Truth = 9371g


Top
   
 Post subject:
Posted: Sun Nov 11, 2007 4:09 pm 


Top
   
 
 Post subject:
PostPosted: Sun Nov 11, 2007 4:43 pm 
Offline

Joined: Sun Nov 28, 2004 1:53 am
Posts: 397
Location: Darmstadt - Germany
do you mean what sence does it make?

it saves you power. Take a look at the search funktion. there are some threads about this.

dark_albert


Top
   
 Post subject:
PostPosted: Sun Nov 11, 2007 10:04 pm 
Offline
User avatar

Joined: Tue Sep 26, 2006 12:37 am
Posts: 5753
Location: Phoenix Arizona
There are also a few threads (or were) about running SRAM with something other than stock pulleys...

I believe depending on what you do, you run the risk of too much swing and rear DER failure.

_________________
charles@pezcyclingnews.com


Top
   
 Post subject:
PostPosted: Mon Nov 12, 2007 2:31 am 
Offline
User avatar

Joined: Thu Oct 05, 2006 4:16 am
Posts: 189
Location: Vancouver, BC
@ dark_albert: once again a really nice execution. Well done. Do you notice any extra flex in the RD now? You'll have to post some comments after you've put some miles on it.

@ pez or anyone else reading this thread that has the answer (and sorry for the slightly off-topic thread jacking :oops: ): I have only heard of Rival RD's failing. What about the Force RD? I have some carbon pulleys (11t) and a carbon cage back plate on mine - just switched from a heavier set of KCNC pulleys. Should I be worried?

_________________
This board and the world in general would be a much nicer place if everyones opinion was respected and if knowledge was shared and not slung around.


Top
   
 Post subject:
PostPosted: Mon Nov 12, 2007 5:31 am 
Offline

Joined: Sat Oct 13, 2007 7:16 am
Posts: 1343
Location: Lyon, France
dark_albert wrote:
it saves you power.


:lol: How many milliwatt?

_________________
Graham


Top
   
 Post subject:
PostPosted: Mon Nov 12, 2007 5:57 am 
Offline

Joined: Wed Aug 30, 2006 9:25 pm
Posts: 245
All it needs now are dimples.


Top
   
 Post subject:
PostPosted: Mon Nov 12, 2007 11:04 pm 
Offline
User avatar

Joined: Wed Sep 26, 2007 1:57 pm
Posts: 7923
Location: San Francisco, CA
PezTech wrote:
There are also a few threads (or were) about running SRAM with something other than stock pulleys...

I believe depending on what you do, you run the risk of too much swing and rear DER failure.


Shouldn't a larger diameter pulley increase the effective cage length, increasing the derailleur capacity?


Top
   
 Post subject:
PostPosted: Tue Nov 13, 2007 10:51 am 
Offline
User avatar

Joined: Thu Aug 05, 2004 7:33 am
Posts: 2436
Location: Europe
Looks good Dark-Albert! Did you manage to get the original cage off the plastic parts it's fixed to without damaging it or did you just cut it off and use the remains to fix the carbon plate to? I have been looking for options to remove the outer arm from the plastic part with the feather inside but I haven't found a way to do so without damaging it to much to get back together again in the right way.

Anyway, I love your tuning jobs so thanks for sharing :thumbup:


Top
   
 Post subject:
PostPosted: Tue Nov 13, 2007 10:58 am 
Offline

Joined: Sun Nov 28, 2004 1:53 am
Posts: 397
Location: Darmstadt - Germany
hi, i just cut it. i didnĀ“t found a way to rebuild it either. But i get some contact to sram right now. maybe i can get some closer infos how to rebuild it.

dark_albert


Top
   
 Post subject:
PostPosted: Tue Nov 13, 2007 12:40 pm 
Offline
User avatar

Joined: Thu Aug 05, 2004 7:33 am
Posts: 2436
Location: Europe
Sounds good. I'm working a little on one of these as well so if you find a way around the pressed in pin maybe you could let us know? It would be convenient if they would use a small m4 or so recessed bolt instead of a pressed in pin just like the cheaper Shimano derailleurs do, it would also help people with damaged derailleurs replacing only the cage if necessary.


Top
   
PostPosted: Sun Aug 08, 2010 5:52 am 
Offline
User avatar

Joined: Wed Sep 26, 2007 1:57 pm
Posts: 7923
Location: San Francisco, CA
Old thread, but I asked Greg Steele, who has one of Dark Albert's mod'ed Red deraillaurs, to give the pulleys a 'spin test". My SRAM pulleys spin for two seconds, which makes me happy, because that's much better than Shimano pulleys, which don't freely spin at all (based on my tests on old Dura-Ace on and what I've read @ BikeTechReview). Anyway, here's the result:



WOW! Of course, unloaded friction isn't necessarily proportional to loaded friction, but nevertheless, that is really impressive.

_________________
http://djconnel.blogspot.com/
Fuji SL/1


Top
   
PostPosted: Sun Aug 08, 2010 6:04 am 
Offline

Joined: Mon Mar 09, 2009 12:51 am
Posts: 212
Location: Tokyo
OMG! :shock: They spun forever! Impressive indeed.


Top
   
PostPosted: Sun Aug 08, 2010 10:29 am 
Offline

Joined: Mon Dec 28, 2009 8:30 pm
Posts: 5558
Location: Bay Area
I tried searching, but didn't use the right combo of terms and I want to know where to get the parts and if anyone has further tested this idea. I'm thinking of doing it to my Force der.

_________________
Don't take me too seriously. The only person that doesn't hate Froome.
Gramz
Bike


Top
   
Posted: Sun Aug 08, 2010 10:29 am 


Top
   
 
PostPosted: Sun Aug 08, 2010 11:28 am 
Offline
User avatar

Joined: Wed Sep 26, 2007 1:57 pm
Posts: 7923
Location: San Francisco, CA
I put my best attempt at modeling the effect of the 15-T cog here.

Here's the link to Dark Albert's service.

_________________
http://djconnel.blogspot.com/
Fuji SL/1


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 15 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. 2015 Super Record Lower Pulley Issues

in Road

davidw

2

358

Mon Oct 10, 2016 6:03 am

davidw View the latest post

There are no new unread posts for this topic. Chain falls off lower jockey wheel SRAM Red 22

in Road

octave

5

405

Sat Feb 04, 2017 9:06 am

Tom14 View the latest post

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

in Road

NiFTY

7

628

Sat Feb 11, 2017 4:49 am

NiFTY View the latest post

There are no new unread posts for this topic. 130mm rear hub with SRAM XD driver?

in Road

Sugarbaker

5

354

Mon Jul 11, 2016 10:42 am

Marin View the latest post

There are no new unread posts for this topic. Sram CX1 shifters and X01 rear derailleur

in Road

bikemaniack

7

429

Fri Jul 29, 2016 6:38 am

kman View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: Baidu [Spider], Bing [Bot], springs, tinozee, Yahoo [Bot] and 28 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