Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Wed Jan 17, 2018 12:31 pm

All times are UTC+01:00

Post new topic  Reply to topic  [ 18 posts ]  Go to page Previous 1 2
Author Message
PostPosted: Thu Oct 24, 2013 6:05 am 
User avatar

Joined: Thu Oct 26, 2006 8:54 pm
Posts: 493
Location: USA
Jooo, apologies: I agree "botch-job" is too strong a word for it. I think "uncharted territory" might have been a better way of phrasing it. We're both interested in finding the best balance of cost/performance/weight, and there's a lot of factors. I agree the Cannondale arms are over-priced, but weight-wise they're good, and the system is well-used even on BSA. S-works definitely seem like a great setup if you have one of the frame BBs you listed. I believe the RaceFace NextSL will retail for $500 so those aren't too terrible cost-wise compared to others (much better than Cannondale), and are a lot lighter than I believe Sram BB30 would be (Sram BB30 only seem to save 50g or so over their GXP alternative... which if so means they still aren't very competitive in terms of weight), and setting them up with proper chainline, etc will be straightforward.

I guess a big question for me is whether the Force arms might be lighter than eg XX1 arms. If so that might make them a more attractive weight and warrant the effort in getting them to work. But it seems odd that it would work on many frames: road Q-factors are often 15-25mm less than mtb ones (eg 140 vs 165) , in which case I would think the arms wouldn't clear the majority of MTB chainstays...

Question is, why are the Sram mountain cranks so heavy compared to their road ones? From this thread it seems like the Red crank arms in BB30 only weigh 370g, whereas the XX1 in this configuration (BB30 with spider) is 496g... That's a huge difference!

Rise Bikes
Wilier Cento1SR Disc

Posted: Thu Oct 24, 2013 6:05 am 

PostPosted: Tue Sep 30, 2014 1:11 pm 
User avatar

Joined: Tue Jun 28, 2011 3:33 am
Posts: 4
I have tried to do this.

Sram Force CX1 GXP crankset on a 2015 Giant Anthem 27.5 that has a 88mm wide shell.

I was attempting to get a lower q-factor on a mountain bike.

The first issue, is that even though the CX1 crank has the same removable spider configuration as XX, X0 cranks, the width of the connection is thinner on the CX1, so a normal MTB Sram spider cannot be used. Also a XX spider and XX chainring will not fit on the CX1 crank, as the chainring hits the crank, the U factor is too small, it works with very large chainrings, such as 110bcd, but they are not practical on a MTB. This was solved going to a spiderless chainring - specifically using Absoluteblack.

The next problem, and most important, is that using a PF86 cup assembly in the frame, the cranks cannot be tightened to hold together securely, without compressing the bearing so much it cannot turn freely.

There is some speculation that using a BB386 cup - designed to work with a spindle width of a GXP crank, but with a spindle thickness of a BB30 (the bearings are very thin and retro fit into a GXP shell) - and some unknown long spindle BB30 crank will work.

Whether or not this would work well enough to get the desired q-factor of the CX1 cranks of 145mm is unknown.

For the amount of trouble it is, the XX1 crank with a q-factor of 156mm seems attractive.

On a side note, the Rotor 3D cranks look like they may work, but only if someone makes a spiderless chainring to suit it - 28t please if a manufacturer is reading.

Pain is your friend - http://www.bigringriding.com/

PostPosted: Sun Oct 12, 2014 3:09 pm 

Joined: Mon Feb 27, 2012 3:45 pm
Posts: 55
Location: Bayern,Germany
Hi guys :)

I ride my Lightning BB30 crank on BSA FS frame,with custom made(at home) BB cups.

Cups have 30,5 mm hole diameter,and axle is 88 mm wide,with custom double chainring,and the Chainline is 47 mm.


BE a bike raider ,NOT a net surfer!

Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 18 posts ]  Go to page Previous 1 2

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Sram Red BB30 110 165mm

in Wanted




Sat Nov 25, 2017 8:15 pm

AZR3 View the latest post

There are no new unread posts for this topic. BB30 : Sram + fsa compatibilty?

in Road




Fri Jul 28, 2017 3:18 am

CycloTron View the latest post

There are no new unread posts for this topic. Attachment(s) Sram Red BB30 cranks & BB30A

in Road




Mon Apr 03, 2017 5:08 pm

Valbrona View the latest post

There are no new unread posts for this topic. SRAM Long-Pin/GXP and Short-Pin/BB30 Chainrings

in Road




Sat Jan 21, 2017 3:21 pm

darnellrm View the latest post

There are no new unread posts for this topic. help installing sram red 22 crank (PF30 with bb30 spindle)

in Road




Mon Dec 04, 2017 11:33 pm

Kurets View the latest post

All times are UTC+01:00

Who is online

Users browsing this forum: No registered users and 8 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