HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




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: 440
Location: 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?

_________________
BMC SLR02 @ 7kg
"Campagnolo; because I ride a bicycle, not a fishing rod"


Top
 Profile  
 
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: 914
Location: Toronto
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
 Profile  
 
PostPosted: Tue Apr 08, 2014 7:24 pm 
Offline
User avatar

Joined: Fri Apr 12, 2013 1:19 pm
Posts: 440
Location: 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.

_________________
BMC SLR02 @ 7kg
"Campagnolo; because I ride a bicycle, not a fishing rod"


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

Joined: Mon May 26, 2008 12:21 pm
Posts: 42
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
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 


Who is online

Users browsing this forum: afalts, Baidu [Spider], coloclimber, emorydptt, Google Adsense [Bot], Yahoo [Bot] and 57 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:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. BMC SLR02 - Fitting Power Torque

in Road

Devon

9

468

Wed Mar 12, 2014 9:46 am

Devon View the latest post

There are no new unread posts for this topic. Campagnolo Over Torque and BB30/PF30

in Road

beeatnik

6

862

Fri Dec 20, 2013 4:50 pm

uraqt View the latest post

There are no new unread posts for this topic. Campagnolo Ultra Torque fit to new AX Lightness Vial Evo

in Road

robhall2003

12

336

Wed Apr 09, 2014 11:26 pm

wingguy View the latest post

There are no new unread posts for this topic. Campagnolo SR Ultra Torque installation question

in Road

isharamet

12

728

Sat Feb 22, 2014 9:24 pm

bontie View the latest post

There are no new unread posts for this topic. Campagnolo Power Meter Choice (Vector or Stages with SISL2)

in Road

9x12man

12

571

Thu Feb 27, 2014 3:24 pm

9x12man View the latest post


It is currently Wed Apr 16, 2014 3:47 pm

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB