Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Fri Dec 09, 2016 3:13 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  [ 26 posts ]  Go to page Previous 1 2
Author Message
PostPosted: Tue Mar 12, 2013 12:28 am 
Offline

Joined: Fri Feb 08, 2013 1:34 am
Posts: 8
I certainly think lightweight carbon clinchers can be a very good option for a variety of cycling situations. However , if riding involves prolonged descending and braking, one could make a strong argument for considering a different brake surface than carbon. Tubulars is of course another excellent option, albeit with some drawbacks, unless one has excellent support during a bike trip. There is always a place for good wheels, regardless of composition. Just choose wisely.


Top
   
PostPosted: Wed Mar 13, 2013 12:44 pm 
Offline

Joined: Sun Jun 12, 2011 8:07 pm
Posts: 69
Wow!!! When people talk about carbon clincher's delaminating i expected a few ripples on the brake track, not the entire rim falling apart.

When decending on tubs, for example an alpine or pyrenean mountain can delamination occur on tubular carbon rims?

Also am i right in thinking the only drawbacks of a carbon tubular rim are:
1) braking may become grabby when the rim becomes too hot
2)the heat may melt/soften the tubular glue
3) lack of braking power if decending in rain

I know this depends on your weight, decending ability and wheel brand, but in principle am i correct. The wheels in question are campy hyperon 2 tub.

Many thanks


Top
   
Posted: Wed Mar 13, 2013 12:44 pm 


Top
   
 
PostPosted: Wed Mar 13, 2013 3:25 pm 
Offline

Joined: Fri Feb 08, 2013 1:34 am
Posts: 8
My point of a drawback, mainly has to do with dealing with a flat, when you are out riding in an area where help is not readily available. Such as when on a bike trip in a foreign country. Tubulars deal with heat dissemination differently then clinchers, hence delamination is less of a risk, although it can happen. Braking efficiency is less than on comparable aluminum rims. Although today's pros seem to handle the braking pretty well. Also see excellent article in todays VeloNews.com regarding carbon clinchers.


Top
   
PostPosted: Sun Mar 17, 2013 8:03 pm 
Offline

Joined: Sat Dec 13, 2003 2:25 am
Posts: 4774
Location: Canada
Holy! That is unreal. I'm glad the rider wasn't badly hurt.

@gb103, tubular wheels have been used in professional racing in the mountains for many years now. They have been proven appropriate for those conditions.

I suspect that the carbon clincher didn't just 'delaminate', rather, it looks like it was blown apart by an over-heated clincher. That is the problem with carbon clinchers. Tubulars do not have that problem. The glue does not overheat. The tubulars do not burst due to overheating.

With respect to being 'grabby', that is a problem of carbon wheels generally. Cork pads help with that problem a bit (for good weather, though). You can also get Kevlar braking surfaces on ADA wheels, which are better, too.


Top
   
PostPosted: Fri Mar 22, 2013 4:19 pm 
Offline
in the industry
User avatar

Joined: Thu Aug 13, 2009 3:47 pm
Posts: 98
eric wrote:
[...]Surprising to see foam core construction in $6000 wheels.

For all those who wonder about "cheap" foam in expensive composite parts => http://en.wikipedia.org/wiki/Sandwich-structured_composite

Concerning the pictures: keep in mind that the wheel was damaged during riding, so it is very hard to evaluate just with the help of a picture what caused the accident and what was caused by the accident!
The shown wheel was out of production 08/2010. Every wheel comes with clearly visible stickers that tell you to carefully read the manual. Appropriate warnings were posted beginning with the first clincher manual!

btw.: nice to see this issue here in the forum, for sure only to warn people of the danger caused by carbon clinchers! :wink:

_________________
Andreas Schiwy, CarbonSports GmbH
http://www.lightweight.info
support[at]lightweight.info


Top
   
PostPosted: Fri Mar 22, 2013 4:40 pm 
Offline
User avatar

Joined: Thu May 04, 2006 4:43 pm
Posts: 5375
Location: Wherever there's a mountain beckoning to be climbed
A little off-topic, but since Andreas apparently didn't see it over in the thread New SwissStop Carbon Pads, has CarbonSports made a determination yet as to use of SwissStop Black Prince pads on Lightweight wheels? Feel free to reply in that thread. Thanks.


Top
   
PostPosted: Fri Mar 22, 2013 5:33 pm 
Offline

Joined: Tue Aug 28, 2012 3:46 pm
Posts: 5
eric wrote:
The pics are tiny.

Surprising to see foam core construction in $6000 wheels.

Why? the foam core rules. the wheels are quiet, not cheap sounding echo chambers like the Enves I used to ride.


Top
   
PostPosted: Sat Mar 23, 2013 4:24 pm 
Offline

Joined: Fri Feb 08, 2013 1:34 am
Posts: 8
For clarification, in regards to the posting by Carbonsports GmbH. while descending in heavy rain, the wheel delaminated and inner tube exploded. By luck, and the fact I was not going that fast, I was able to come to a complete standstill without the bike ever touching the ground. Therefore no chance the accident caused any damage seen on pics. Based on conversations with friends in the bike industry in Britain, Germany and France, I believe this type of delamination is not that uncommon with the particular type of Lightweight clinchers I rode. Let's hope the My 2013's do not have the same issue. Just to be extra safe however, this summer in the Dolomitis I am riding on alloy wheels.


Top
   
PostPosted: Sat Mar 23, 2013 4:39 pm 
Offline

Joined: Thu Feb 03, 2011 2:28 pm
Posts: 383
CarbonSportsGmbH wrote:
The shown wheel was out of production 08/2010.


I don't understand the relevance of this. Are you saying that 2010 clinchers are more prone to delamination than current production models?


Top
   
PostPosted: Sat Mar 23, 2013 8:19 pm 
Offline

Joined: Sat May 12, 2007 3:40 am
Posts: 483
Location: Triange, NC
gravlax wrote:
For clarification, in regards to the posting by Carbonsports GmbH. while descending in heavy rain, the wheel delaminated and inner tube exploded. By luck, and the fact I was not going that fast, I was able to come to a complete standstill without the bike ever touching the ground. Therefore no chance the accident caused any damage seen on pics. Based on conversations with friends in the bike industry in Britain, Germany and France, I believe this type of delamination is not that uncommon with the particular type of Lightweight clinchers I rode. Let's hope the My 2013's do not have the same issue. Just to be extra safe however, this summer in the Dolomitis I am riding on alloy wheels.


Riding alloy wheels during long descents, wet or dry is a very good idea. In fact I want alloys during any mountain riding. I just don't see any significant advantage of carbon given the robust construction and relative light weight alloy clinchers available today (eg; Shimano DA C24's). Yes, carbon wheels may carry a few grams less weight but they also carry risks - not the least of which is relative poor braking.

I don't believe any carbon wheel is immune to possible delamination due to the intense spot heating effect and resulting shear forces generated within the composite structure (including any core material like foam). Cores of foam or honeycomb do add structural integrity however, these cores are generally bonded to the laminate and this junction itself is subject to shear forces during heating (see the article posted by Carbonsports above).

It would be nice if Carbonsports provided information on the testing that they subject their wheels to in order for customers to better educated and able to make the decision whether the risks of carbon wheels are worth the staggeringly high price.


Top
   
PostPosted: Wed Jun 12, 2013 5:00 pm 
Offline

Joined: Thu Sep 03, 2009 10:02 am
Posts: 71
I have owned my Standard C's for about 3 years now, with very little use (the weather in the UK is so bad, even in the summer months!). I took my bike (with the Lightweights) to Italy this May and when cleaning the wheels after my first ride I noticed an area approximately 2.5cm along the braking surface which was very soft - I recon if I pushed with any force it would have broken through.

A friend of mine who lives in Germany was on holiday with me and he immediately put the wheel in his car, promising to send them to CarbonSports when he got home.

I have just heard that the verdict of CarbonSports is that the wheel is not repairable and they have offered me 30% off a new wheel. Is this reasonable? It's not my fault that the braking surface is faulty. I know it's out of warranty, but should I spend a huge amount of money (even with discount) buying a wheel which is prone to this kind of fault?


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 26 posts ]  Go to page Previous 1 2

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Attachment(s) Lightweight standard cracks?

in Everything wheels

NiFTY

7

877

Thu Nov 10, 2016 12:22 pm

NiFTY View the latest post

There are no new unread posts for this topic. Lightweight Standard 3 - Tire Problem

in Everything wheels

Nejmann

11

486

Tue Sep 06, 2016 1:56 pm

PrimO View the latest post

There are no new unread posts for this topic. 2 x Lightweight Standard Clincher front wheels

in For sale - Pictures are mandatory 22-3-13

Simon BP

0

302

Tue Sep 27, 2016 11:44 am

Simon BP 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

1375

Thu Dec 24, 2015 2:13 pm

itsacarr View the latest post

There are no new unread posts for this topic. Attachment(s) ENVE standard handlebar 44cm

in For sale - Pictures are mandatory 22-3-13

VTR1000SP2

0

205

Fri Sep 16, 2016 2:56 am

VTR1000SP2 View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: No registered users and 6 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