Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Thu Dec 14, 2017 11:23 am

All times are UTC+01:00





Post new topic  Reply to topic  [ 21 posts ]  Go to page Previous 1 2
Author Message
 Post subject: Re: Fork failures
PostPosted: Wed Aug 16, 2017 2:18 am 
Offline

Joined: Wed Sep 20, 2006 1:03 am
Posts: 507
Location: Madison, WI USA
I remember something along those lines, but I also remember my 2007 R3 came with a Wolf fork, but it was recalled and replaced with a 3T fork. If the shipping boxes were the only issue, why would they have gone to 3T forks? Maybe they didn't want the liability that came with a house-designed fork...who knows?


Top
   
 Post subject: Re: Fork failures
PostPosted: Wed Aug 16, 2017 3:47 am 
Offline

Joined: Fri Jun 11, 2010 2:39 am
Posts: 38
@miller

Nope, I haven't noticed anything the last couple times i pulled the fork off. But having said that, I wasn't specifically looking for damage (I have layed the bike down in a few corners but never had a front on collision)


Top
   
 Post subject: Re: Fork failures
Posted: Wed Aug 16, 2017 3:47 am 


Top
   
 
 Post subject: Re: Fork failures
PostPosted: Wed Aug 16, 2017 5:23 am 
Offline
User avatar

Joined: Tue Jul 26, 2016 8:43 pm
Posts: 204
Location: Los Angeles, California
youngs_modulus wrote:
You say "full carbon fiber Trek," but it's unclear whether "full carbon fiber" means the frame or the frame and the fork.

I'd love to see a photo of the broken pieces. I'm a mechanical engineer with a lot of experience in composite structures, so I'm not just idly curious.

I have a friend who sustained an ugly brain injury when his Manitou II fork crown suddenly gave way. A design flaw created a stress concentration, which in turn initiated a crack and led to catastrophic failure. That fork, it turns out, had been recalled because of the flaw.

I seriously doubt that there's a design flaw in your friend's fork crown, but there could have been a problem with the manufacturing. In that case, the most likely culprit is a large void in the matrix (assuming the fork is entirely carbon). If so, a photo may show that void or possibly another flaw.

It's also possible that the guy put the bike on the roof of his car and then tapped the top of his garage with the bars (or something like that). I'm not trying to blame the guy you rode with, but all of these things (design flaw, manufacturing defect, user-inflicted damage prior to failure) are possibilities. Pictures would help, but they may also be entirely inconclusive.

To be honest, I think it's a bit early to talk about "pursuing a case" (suing?) without any evidence about the root cause of the failure. The guy might know in the back of his mind that he hit a curb pretty hard two months ago, or he may have clear evidence of a manufacturing defect. None of us here has enough information to say either way. Regardless of that little question, I hope your riding partner heals quickly and is back on a new bike soon.


The OP asked for instance of a fork failure, so I gave one. Big group Saturday ride on July 15 of about sixty-plus riders. I did not know either of the riders who crashed, but with tons of blood on the pavement and one dude having difficulty breathing with broken ribs, it was a sickening sight. I glanced over and noticed the first one down rode a newer high-end Trek. No idea if it was full carbon steerer, but the newest high-end models seem to use that mix. You are reading way too much into it. A few of us conjectured that a snapped fork steerer seemed unusual. And, if it happened to us, we'd be pissed and likely to find the root cause and possibly pursue restitution. Paramedics air-lifted him out via helicopter to get him to a proper hospital.

_________________
Oldbie


Top
   
 Post subject: Re: Fork failures
PostPosted: Wed Aug 16, 2017 5:51 am 
Offline

Joined: Sat Oct 10, 2009 7:13 am
Posts: 1112
Location: 93306
What ride were you on?


Top
   
 Post subject: Re: Fork failures
PostPosted: Wed Aug 16, 2017 12:12 pm 
Offline
User avatar

Joined: Tue Feb 05, 2013 2:46 pm
Posts: 306
youngs_modulus wrote:
I remember something along those lines, but I also remember my 2007 R3 came with a Wolf fork, but it was recalled and replaced with a 3T fork. If the shipping boxes were the only issue, why would they have gone to 3T forks? Maybe they didn't want the liability that came with a house-designed fork...who knows?


Ah.. the resin 'word'.. liability... or in reality how to avoid it.. the responsibility for the product being marketed. Pre-plastic bike forks it was rare to hear of a fork issue.... post-plastic plastic resin forks it's common place. Why.. does the buying public accept this? "Oh.. that'll happen to someone else". Bullsh*t... what goes around comes around... your next.

Then the long blatter of 'fine print' attached to bikes on display... I use readers and can't even determine wording using a magnifier... what.. is being hidden? In fact it's the escape clause for these "bike companies"... the instructions for plastic forks essentially means the rider is supposed to be nearly a mechanical engineer.. to determine what the severity level is for road impacts... when to climb off and walk home post pot hole encounter. That is more bullsh*t... a huge load.

It's what it is: this is the 21st century. Bottom $$ line is paramount now... human lives are just cost factor.. "law" now mitigates that corp risk.


Top
   
 Post subject: Re: Fork failures
PostPosted: Wed Aug 16, 2017 3:41 pm 
Offline
User avatar

Joined: Tue Jul 26, 2016 8:43 pm
Posts: 204
Location: Los Angeles, California
tonytourist wrote:
What ride were you on?


7:45 Montrose.

_________________
Oldbie


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 21 posts ]  Go to page Previous 1 2

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Fork length Ridley Helium SLX fork?

in Road

Beaver

2

423

Mon Jul 17, 2017 5:31 pm

Beaver View the latest post

There are no new unread posts for this topic. New Fork for the Look 585. Suggestions?

in Road

Catagory6

1

158

Thu Dec 07, 2017 3:41 pm

Svetty View the latest post

There are no new unread posts for this topic. Parlee....help in fork ID

in Road

blaine

0

388

Sun May 28, 2017 7:38 pm

blaine View the latest post

There are no new unread posts for this topic. Attachment(s) PLEASE HELP!!!! FORK ISSUES!!!!

in Road

2phat2slow

1

404

Thu Oct 19, 2017 8:15 am

Stolichnaya View the latest post

There are no new unread posts for this topic. Attachment(s) PLEASE HELP!!!! FORK ISSUES!!!!

in Road

2phat2slow

1

413

Thu Oct 19, 2017 6:32 am

anquetil View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: Google [Bot], hannawald, raisinberry777, sawyer, StradaJon, TobinHatesYou, TomHelly, Yahoo [Bot] and 32 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