Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About
It is currently Mon Jul 25, 2016 11:31 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  [ 30 posts ]  Go to page 1 2 Next
Author Message
PostPosted: Sat May 18, 2013 5:50 pm 
Offline

Joined: Wed Mar 05, 2008 9:41 pm
Posts: 41
Location: Washington State
This may be a dumb question, but I was wondering if anyone has tried building up a set of 29er wheels with carbon tubular road rims since they are, to my understanding, approximately the same size. Farsports' rims and wheels have been getting good reviews over in the road forum and it looks like they do a 260g, 24mm-deep rim with up to 32 hole drilling that might work. Of course, it might be slightly too small for a 29er tire.

_________________
Andrew "Jersey" L


Top
   
PostPosted: Sun May 19, 2013 3:06 pm 
Offline
User avatar

Joined: Thu Mar 17, 2005 3:25 am
Posts: 2206
Location: Southern Indiana USA
Road rims are generally not rated for disc brakes and also generally do not have enough spoke holes for a durable 29er wheel. In most cases you need at least 28 spokes and everything disc rated. Since there are few hubs and rims with 28 holes you will probably end up at 32.

_________________
For certain parts stiffer is more important than lighter.


Top
   
PostPosted: Mon May 20, 2013 1:42 am 
Offline

Joined: Wed Mar 05, 2008 9:41 pm
Posts: 41
Location: Washington State
It looks like the one I mentioned above from Farsports can be 28 or 32 holes so that would not be a problem. As for being rated for disc brakes I'm not sure what you mean. To my understanding rims are usually more stressed out by rim brakes than from discs. As in, a rim with a rim brake track will usually be heavier than the same rim without because it will require more material not only for the track but on the inside ("bridge?") to withstand the force of being pinched by the caliper. Correct me if I'm wrong.

It seems like the only factor would be the outer diameter in this case.

_________________
Andrew "Jersey" L


Top
   
PostPosted: Mon May 20, 2013 3:04 am 
Offline
User avatar

Joined: Thu Mar 17, 2005 3:25 am
Posts: 2206
Location: Southern Indiana USA
The spoke holes have to be stronger on disc wheels since all the braking force is transmitted through the spokes to the rim and tire. A non-disc rated rim will soon start to crack the spoke holes on the spokes that pull when you use the disc. Also, a rim with a brake track will generally weigh more than a disc rated rim so I don't see the advantage of this build.

_________________
For certain parts stiffer is more important than lighter.


Top
   
 Post subject:
PostPosted: Mon May 20, 2013 3:51 am 
Offline

Joined: Sat Jun 16, 2012 3:12 am
Posts: 394
yourdaguy wrote:
The spoke holes have to be stronger on disc wheels since all the braking force is transmitted through the spokes to the rim and tire. A non-disc rated rim will soon start to crack the spoke holes on the spokes that pull when you use the disc. Also, a rim with a brake track will generally weigh more than a disc rated rim so I don't see the advantage of this build.


This may be true in theory (I don't know that it is or isn't), but in practice folks like Velocity and Stans (and I am sure many others) offer disc builds with their road rims which to my knowledge have no additional material added to the spoke holes. It would probably be a good idea to use washers, but then that probably never hurts. And 28h is a pretty commonly available drilling for road rims ...

I believe Farsports offers disc builds of their CX rims? Or maybe I am confusing them with one of the others.


Top
   
PostPosted: Mon May 20, 2013 5:26 am 
Offline

Joined: Sun Jan 01, 2012 9:58 am
Posts: 406
the farsport 24/25mm wide "CX" rims might be worthy candidates, though they are significantly heavier than the 260g rims you're talking about.

interested to see how this goes...


Top
   
PostPosted: Thu May 23, 2013 7:04 pm 
Offline

Joined: Thu Jan 08, 2004 10:11 pm
Posts: 784
Planet X do carbon cyclocross wheelsets with disc hubs. Price is pretty damn impressive also...


Top
   
PostPosted: Fri May 24, 2013 6:33 am 
Offline

Joined: Wed Mar 05, 2008 9:41 pm
Posts: 41
Location: Washington State
Those are a good price and the weight is pretty good, too, but I'm looking for rims that are sub-300g or tubular wheels that are sub 1200g and far below the price bracket of Extralite and AX Lightness.

I guess it doesn't matter that much since a pair of tubular 29er tires weigh 200g more than their clincher counterparts and there are several reasonably priced 29er clincher wheelsets in the 1400g range. While I love Stan's bead hook I would like something stiffer than the Race Golds at the same weight; though I have not tried the that wheelset, I'm just going on reviews. Farsports' carbon 29er wheelset is advertised at 1410g but I'm leery of running them tubeless. Even though they are probably stiffer it's not worth the trouble dealing with burping tires if they don't have the tight interface with the bead. So I was thinking that a carbon tubular wheelset might fit the bill.

Those 260g rims that I mentioned are 20.5mm wide. Do you guys think that loosing 3.5mm of width (Enve tubulars are 24mm wide) would be a big deal? Maybe we can convince Farsports to make a 24mm-wide tubular rim that's a few grams heavier.

_________________
Andrew "Jersey" L


Top
   
PostPosted: Mon May 27, 2013 9:16 am 
Offline

Joined: Tue Apr 12, 2011 8:08 am
Posts: 2290
Location: Pedal Square
Lofty goals, but I would be wary of using a big tyre with narrow rim, and run it at low pressure. The Glueing tubulars thread has lots of good info, including CX glueing practices.

In general I'd not worry too much about spoke holes tearing from disc usage, unless you're a beefcake. The (also negative) acceleration offroad seems to be limited by grip anyway. What might be a concern however, is that a single bottom-out on a 260g rim could be the end of your race. For hillclimbs and smooth XC courses such a set would be quite appealing, though.

_________________
Bikes: Raw Ti, 650b flatbar CX


Top
   
PostPosted: Mon May 27, 2013 11:26 am 
Offline
User avatar

Joined: Sun Oct 07, 2012 2:39 am
Posts: 683
Location: Blacksburg, VA
I'd love to have a set of 26mm tubular rims, like those on the DT Swiss 950Ts.

Are these companies listening?


Top
   
PostPosted: Mon May 27, 2013 5:07 pm 
Offline
User avatar

Joined: Wed May 13, 2009 5:23 pm
Posts: 960
Location: Denmark
AX Lightness claim the SRT CC 29er rims weigh 255 g each, and measure 28 (height) x 25.5 (width) mm. The ENVEs are not too far off, and probably a bit stiffer because of the incresed weight.

Maybe I missed something, but why not go for tubular rims by either AX Lightness or ENVE?

_________________
Cannondale F-Si Team 2015
Cannondale F29 Team 2014
Cannondale F29 Carbon 1 2013


Top
   
PostPosted: Mon May 27, 2013 6:05 pm 
Offline

Joined: Sat Oct 10, 2009 7:13 am
Posts: 986
Location: 93306
Cost? :P


Top
   
PostPosted: Tue May 28, 2013 8:54 am 
Offline
User avatar

Joined: Sun Oct 07, 2012 2:39 am
Posts: 683
Location: Blacksburg, VA
So, looking at the DT Swiss 950t rims vs. the 23mm wide generic carbon offerings, it looks like they have more or less the same gluing surface, in terms of width available to support a tire. Anyone have experience with either, when it comes to mounting 50mm tubulars?

Image

Image


Top
   
PostPosted: Fri Jun 21, 2013 8:18 am 
Offline

Joined: Thu May 31, 2012 8:42 am
Posts: 5
I've built up AX-lightness tubular 29er rims with extralite hubs and CX/rays however these rims which produced 1090gr 29er wheels are totally different in profile to a road rim they're quite wide and feel far stiffer both radially and literally. My suggestion don't risk it use Innolite or AX or even FRM alloy


Top
   
PostPosted: Fri Sep 27, 2013 10:18 am 
Offline

Joined: Fri Sep 27, 2013 9:55 am
Posts: 3
Hi I am new member here. :D
Would like to discuss with you guys about those cheap china carbon tubulars.
My 29er wheel seems heavy, slow , sloggy ect. I am king of feeding up with it.. :x
Just thinking mtb tubulars would gain some advantages in ways of speed, weight and performance....

I have questions.
29er tubular tire options seems limited??
I can't find much vendor that offer wide 29er tubular rims, do you have recommendation?

:welcome: and idea?


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 30 posts ]  Go to page 1 2 Next

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. WTB: High End Tubular Road Wheelset

in Wanted

mnmasotto

0

141

Fri May 27, 2016 4:55 am

mnmasotto View the latest post

There are no new unread posts for this topic. Anyone used Maxxis Campione Tubular 3C Road K2

in Everything wheels

wheelsONfire

1

181

Tue Oct 06, 2015 12:35 pm

wheelsONfire View the latest post

There are no new unread posts for this topic. ENVE 2.2 Tubular, Rear Wheel Stiffness / Break Rub

in Everything wheels

CEVelo

13

1031

Tue May 10, 2016 5:11 am

CEVelo View the latest post

There are no new unread posts for this topic. Planned MTB Wheel build

in Everything wheels

wpccrunner

3

134

Sat Apr 02, 2016 1:55 pm

F45 View the latest post

There are no new unread posts for this topic. Need Comment for AX Lightness Premium Road 55 wheel set

in Everything wheels

jet520

4

514

Sun Dec 13, 2015 4:09 pm

wheelsONfire View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: No registered users and 9 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