Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About
It is currently Wed Aug 31, 2016 9:29 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: Sun Mar 27, 2016 7:44 am 
Offline

Joined: Wed Nov 11, 2015 9:36 am
Posts: 68
Location: Yorkshire, UK / Bangkok, Thailand
Hi all, I know this has been discussed in 2016 'PRO' cycling discussion. However, I think it is worth its own discussion (feel free to disagree).

Fabian was caught with a mechanical problem around 65km. to the line. He lost quite a significant amount of time but managed to get back.

If we look closely in this photo from ave that his chain appeared not to be routed properly through the pin and was outside of the pulley.

Image

At this point, it appears to be the mechanic's false. However, JasperGr posted another photo of Fabian earlier in the race and his bike seemed perfect. The chain was routed correctly through the pin and pulley.

Image

How did that happen? I think it is almost impossible for the chain to get outside of the pulley with the pin still intact (or perhaps, it wasn't but appeared to be)? Has anyone ever experienced this before?

The only explanation I can speculate at this point is that something, like a small rock or stick, got stuck on his chain just before it goes into the pulley and forced the chain to slip out of the pulley. With the amount of power Fabian can produce, he can easily rip the chain through the pulley and pin. However, that didn't really appear to happen as the pulley and rear mech must appear much worse.

Chanon


Top
   
PostPosted: Sun Mar 27, 2016 7:58 am 
Online

Joined: Sun Mar 27, 2016 7:53 am
Posts: 20
I know that Ashleigh Moolman (Riding for Bigla Ladies) also experienced the same thing at ladt years world champs. I was looking at a Dura-Ace RD yesterday and noticed that it is quite easy to flex the rear carbon plate by hand. I was able to open a big enough gap for the chain to be able to hook in to the gap.


Top
   
PostPosted: Sun Mar 27, 2016 12:25 pm 
Offline
User avatar

Joined: Thu Mar 24, 2011 6:06 pm
Posts: 649
Happened to a friend twice on the same ride when he changed to using aftermarket pulley wheels, so I know it definitely happens during the ride, not sure how exactly though.

_________________
Trek Mad-one 7 Series team colours http://weightweenies.starbike.com/forum/viewtopic.php?f=10&t=115500&start=15


Top
   
PostPosted: Sun Mar 27, 2016 1:38 pm 
Offline

Joined: Sun Mar 02, 2014 6:36 pm
Posts: 325
Location: NY USA
I had it happen to me with a SRAM derailleur, carbon fiber pulley plates.

Small stick popped up from being hit by a tire, wedged between chain and pulley, and effectivly became a "derailleur" that derailed the pulley. Between the stick and the chain, there was plenty of leverage to snap the pulley cage plate.

In the first pic you show, that outer plate is not in proper working order.

_________________
Trek Madone 7.9 58cm 14.9lbs


Top
   
PostPosted: Mon Mar 28, 2016 12:54 am 
Offline
User avatar

Joined: Fri Jul 23, 2004 8:24 pm
Posts: 1846
Location: Houston, Texas
Kayrehn wrote:
Happened to a friend twice on the same ride when he changed to using aftermarket pulley wheels

Similar issue occurred with my wife's bike running Di2 9070 after I swapped out the stock pulleys with Tiso alloy pulleys. The alloy 'guide' pins on the derailleur cage are only secured on one side, so when the cage flexed, the chain jumped through the gap in between the cage and guide pins and the guide pulley (lower) snapped in half which then snagged the chain. At that point the derailleur hanger snapped off and no damage was done to the derailleur cage and fortunately it happened only 1/2 mile from where we were parked. Suffice to say after that lesson, I am no longer using after market pulleys on our bikes.

_________________
Michael - The Anaerobic Threshold is neither...


Last edited by ms6073 on Thu Mar 31, 2016 5:09 am, edited 1 time in total.

Top
   
PostPosted: Mon Mar 28, 2016 9:01 am 
Offline

Joined: Wed Nov 11, 2015 9:36 am
Posts: 68
Location: Yorkshire, UK / Bangkok, Thailand
After all, this problem appears not to be too uncommon. But with great working conditions of all components on the bike and the fact that the bike was setup by one of the best mechanic in the world, it must be extremely bad luck for Cancellara to got caught up with this mechanical problem.


Top
   
PostPosted: Sun Apr 03, 2016 9:14 pm 
Offline

Joined: Thu Sep 05, 2013 3:29 pm
Posts: 223
I've seen this happen too, both as a result of objects getting caught in the derailleur or the chain popping off the pulley teeth and wedging between pulley and cage. Sometimes the cage tabs have broken off, but other times they simply flexed and allowed the chain to escape, preventing the chain from being returned to it proper position until the derailleur was disassembled.


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. Canyon Ultimate SLX 2016 DA Mechanical Drivetrain Noisy

[ Go to page: 1 2 ]

in Road

probertsqbe

19

1110

Fri Aug 19, 2016 9:58 pm

probertsqbe View the latest post

There are no new unread posts for this topic. 2016 Felt AR FRD and running Sram Force 1 mechanical group on it?

in Road

gerardk1111

3

376

Wed Jun 29, 2016 3:48 pm

gerardk1111 View the latest post

There are no new unread posts for this topic. New Formula R1 Racing (2016) - piston problem

[ Go to page: 1 2 ]

in MTB

HaakonJohansen

18

1067

Tue Apr 19, 2016 8:19 pm

DanW View the latest post

There are no new unread posts for this topic. Attachment(s) New build - which frame?!? 2016 Evo Hi mod vs 2016 BMC SLR01

in Road

dak

8

1047

Mon Aug 29, 2016 3:04 pm

dak View the latest post

There are no new unread posts for this topic. Etap or mechanical 22?

[ Go to page: 1 2 ]

in Road

nickf

15

2574

Tue May 17, 2016 8:18 am

2old4this View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: J00P, ratt, zazo and 7 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