Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Wed Jun 28, 2017 8:39 pm

All times are UTC+01:00





Post new topic  Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Tue Apr 08, 2014 6:57 pm 
Offline
User avatar

Joined: Fri Apr 12, 2013 1:19 pm
Posts: 768
Location: South West England
So I had a local mechanic fit my crank to my new frame as he had the required tools. First ride, the crank falls off after 30km.

I give it a good look over and the crank (non-driveside) is freely sliding on and off the splined axle. I distinctly remember this being impossible when I originally fitted the crank to my old bike as it was such a tight fit (and hence the need for a crank puller). This is no longer the case.

He's fitted it back on for me but considering it's only being held on by the securing bolt/screw I can't trust it enough to ride the bike.

Has he broken my crank? What should I do?

_________________
Campagnolo; because I ride a bicycle, not a fishing rod.
M∆SON Definition / Camapgnolo endurance & bikepacking build - ~8.4kg


Top
   
Posted: Tue Apr 08, 2014 6:57 pm 


Top
   
 
PostPosted: Tue Apr 08, 2014 7:15 pm 
Offline
User avatar

Joined: Fri Dec 11, 2009 10:38 pm
Posts: 1774
Location: Welland, Ontario
Sounds like your local guy was missing a required tool - a torque wrench, and guessed wrong.

This is nice example as to why you should buy the tools and do it yourself.

So, you gave him a second chance?

I don't think we are able to forecast over the internet if it's going to be OK or not. Either you trust the guy or you don't.

_________________
There's sometimes a buggy.
How many drivers does a buggy have?

One.

So let's just say I'm drivin' this buggy...
and if you fix your attitude you can ride along with me.

http://www.youtube.com/watch?v=GekiIMh4ZkM


Top
   
PostPosted: Tue Apr 08, 2014 7:24 pm 
Offline
User avatar

Joined: Fri Apr 12, 2013 1:19 pm
Posts: 768
Location: South West England
The way I see it it's his responsibility to fix it. The thing I'm concerned about is that a torque wrench shouldn't be required. The non-driveside crank arm should be held in by friction on the tight fit spline and therefore stay in weather you have the securing bolt there or not, but in my case, the securing bolt is the only thing holding the arm on.

I'm taking it to another shop for a second opinion tomorrow but would basically like as much evidence as possible to take this guy down - if it's broken, he owes me a crank.

_________________
Campagnolo; because I ride a bicycle, not a fishing rod.
M∆SON Definition / Camapgnolo endurance & bikepacking build - ~8.4kg


Top
   
PostPosted: Tue Apr 08, 2014 8:42 pm 
Offline
Shop Owner / Manufacturer

Joined: Mon May 26, 2008 12:21 pm
Posts: 245
Location: UK
Hi Devon

A torque wrench *is* required - that is why Campagnolo give a torque setting for the axle end bolt.

If the crank is not driven the correct distance up the splines, which are tapered, it can fret and deform and will indeed eventually fall off - it will behave in essence just like an under-tightened square taper crank.

It may be that the splines are also damaged, careful examination required by (we would advise) ourselves if you are in the UK, or someone very familiar with PowerTorque and who has spare units to cross-check against.

You don't say if the crank is alloy or carbon - it may be that the alloy insert, for whatever reason, has failed in the carbon, if it's the carbon crank, so allowing you to push the crank freely up the splines of the BB axle - as I would be surprised if wear caused in a single 30km ride was enough to make this possible, though it does of course depend how far up the splines the crank will push by hand.

This is not a problem that Campagnolo have an case open for at Vicenza as far as I know, so it sounds as if it *may* be a fitting error - but every (potentially) warranty-type case has a first occurrence, so it would be useful for a Service Centre to look at this for you.

HTH
Graeme

_________________
A Tech-Reps work is never done ...
Head Tech, Campagnolo main UK ASC


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 4 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. How To Fit A Campagnolo Ultra Torque Crank To Cannondale PF30a BB

in Road

JayTheCyclist

7

649

Sat Apr 22, 2017 10:44 pm

stormur View the latest post

There are no new unread posts for this topic. Campagnolo Ultra Torque Crank/Axle Tool

[ Go to page: 1 2 ]

in Road

Devon

26

1465

Thu Jul 21, 2016 12:13 am

Calnago View the latest post

There are no new unread posts for this topic. Campagnolo Ultra torque advise

in Road

Tricky1

5

433

Wed Mar 29, 2017 6:53 pm

graeme_f_k View the latest post

There are no new unread posts for this topic. Campagnolo Over Torque Left Crankarm fell off

[ Go to page: 1 2 3 ]

in Road

maverick_1

31

2255

Fri Dec 02, 2016 1:15 am

maverick_1 View the latest post

There are no new unread posts for this topic. Colnago E1 and Campagnolo Comp Ultra Over Torque

in Road

alistaird

2

478

Sun Jun 04, 2017 12:19 pm

alistaird View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: antonio07, Baidu [Spider], EvilEuro, Google Adsense [Bot], Leviathan, Majestic-12 [Bot], oldturd, roadhog44, sethjkay, trimenc, Vuong05, wheelsONfire, Yahoo [Bot] and 49 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