Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About
It is currently Sat Jul 23, 2016 10:48 am
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  [ 7 posts ] 
Author Message
PostPosted: Mon Sep 07, 2015 2:48 am 
Offline

Joined: Fri Oct 28, 2011 3:25 am
Posts: 1298
Location: United Kingdom of Great Britain and Northern Ireland
Not being a SRAM kind of person, I am wondering how the chainrings attach to a high-end SRAM crankset. Well, more accurately, what is the fixing arrangement in the case of the fixing-point hidden behind the crank arm?

I have a SRAM crankset travelling across the Atlantic and thought I would get a head start in trying to fit a pair of FSA Super Road rings to it. I know I will have to remove the chain catcher pin from the outer ring.

Thanks.


Top
   
PostPosted: Mon Sep 07, 2015 3:29 am 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8282
Location: Los Angeles / Glendale, California
The four exposed bolts are normal doubles.
The hidden is one extra long bolt with a spacer that goes between the two chainrings. I am not sure if it is the same length as the old "granny" bolt found on the "3 chainring" style cranks or if it is specifically spec'd by SRAM.

If the crankset is arriving with the SRAM chainrings already installed, use the same bolts for the installation of the chainrings of your choice.

Have fun out there!

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Mon Sep 07, 2015 4:02 am 
Offline
User avatar

Joined: Wed Jun 08, 2011 6:08 am
Posts: 524
The SRAM oem chainrings are the same thickness at the bolt interface as "normal" 5 bolt rings, about 0.160", but the width of the area around the bolt at the hidden bolt is narrower. Take a dremel or end mill and shave down this area so your rings fit snugly in the hidden bolt area.

For the chain catcher pin, the oem diameter is 0.200" but any diameter near that size is fine. Buy some aluminum bar stock and a drill bit that are the same size, say 0.250". Drill the hole and sand down the new pin just enough to get it in there. Then smash it like a rivet, either in a press or a vice, until it gives an interference fit.

Praxis just came out with purpose made rings for this crankset so you could just buy those.


Top
   
PostPosted: Mon Sep 07, 2015 4:08 am 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8282
Location: Los Angeles / Glendale, California
...or just don't use a catcher pin, have your drivetrain set up properly, and save some weight. This is Weight Weenies.

And I disagree about the "take a dremel and shave it down" comment. The normal Praxis chainrings fit just fine, without any modifications, on SRAM Red cranksets. This has been discussed, at length, on this forum, and verified by Praxis. Praxis is releasing a "SRAM-specific" chainset because people out there don't know how to look with their own eyes at how something works and instead need someone to sell them a specific product for their "unique" situation. Hey, it's business.

Might want to read up, start here: viewtopic.php?f=3&t=103730&start=135#p916432
It goes on for a few more pages, including pictures when people just don't seem to get a how a circle works.

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Mon Sep 07, 2015 2:32 pm 
Offline
User avatar

Joined: Wed Jun 08, 2011 6:08 am
Posts: 524
Well, just a few days ago I fitted a Praxis cx ring set, 48 36, to fit on my Red 22 hidden bolt crankset. The end mill was necessary. Your insults are not.


Top
   
PostPosted: Tue Sep 08, 2015 3:03 am 
Offline
User avatar

Joined: Wed Oct 31, 2007 10:32 pm
Posts: 8282
Location: Los Angeles / Glendale, California
It wasn't personal, F45.
Really.

In that thread you'll see that people don't know how a circle works. You're not in that thread.

_________________
Exp001 || Other projects in the works.


Top
   
PostPosted: Wed Sep 09, 2015 12:21 am 
Offline

Joined: Fri Oct 28, 2011 3:25 am
Posts: 1298
Location: United Kingdom of Great Britain and Northern Ireland
Oops - I didn't see the mega 'Red Crankset' thread.

In summary: filing of outer chainring required only in the case of BB30/compact format, and then rotate both rings 180 degree for optimal alignment.


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 7 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Sram Red exogram : chainrings option

in Road

stormur

2

246

Sun May 01, 2016 6:04 pm

stormur View the latest post

There are no new unread posts for this topic. Standard chainrings for 110 BCD

[ Go to page: 1 2 ]

in Road

Tinea Pedis

22

1027

Thu Dec 24, 2015 2:13 pm

itsacarr View the latest post

There are no new unread posts for this topic. 'Non Paired' Chainrings

in Road

Valbrona

13

1193

Mon Aug 17, 2015 2:08 pm

tabmaster View the latest post

There are no new unread posts for this topic. AfterMarketg Compact Chainrings...?

in Road

TheDarkInstall

11

503

Sat Jun 04, 2016 12:34 am

RyanH View the latest post

There are no new unread posts for this topic. 7800 chainrings with 11speed setup?

in Road

Lightweenie

3

237

Fri Mar 18, 2016 12:27 pm

BikeAnon View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: Bing [Bot], Exabot [Bot], Google [Bot], Yahoo [Bot] and 17 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