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logy
 Post subject: Dura Ace BB
PostPosted: Mon Aug 06, 2012 5:54 pm 
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Joined: Fri Jun 03, 2011 6:30 pm
Posts: 46
Anyoneknow why my Canyon CF should chew through a BB in 3 months?
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Weenie
 Post subject: Dura Ace BB
Posted: Mon Aug 06, 2012 5:54 pm 


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justkeepedaling
 Post subject: Re: Dura Ace BB
PostPosted: Mon Aug 06, 2012 7:26 pm 
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Joined: Thu Jan 03, 2008 6:14 am
Posts: 1115
Location: by Crystal Springs (Sawyer Creek Trail)
Chew through as in the bearings? Could have been set too tight
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logy
 Post subject: Re: Dura Ace BB
PostPosted: Mon Aug 06, 2012 8:19 pm 
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Joined: Fri Jun 03, 2011 6:30 pm
Posts: 46
Maybe. The bearings creek. It is difficult to set the torque on the end-cap of the crank. Any suggestions?
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breezerboy
 Post subject: Re: Dura Ace BB
PostPosted: Mon Aug 06, 2012 8:27 pm 
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Shop Owner
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Joined: Fri Jun 22, 2007 8:14 pm
Posts: 230
Location: UK
Is the BB shell parallel? Many frames don't come with the shell accurately machined causing premature BB failure.

If your shell is alloy with no carbon covering the faces it can be checked/machined by a decent bike shop. Of course, some carbon frames can be damaged by this machining so take it to someone who knows what they're doing.
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daj
 Post subject: Re: Dura Ace BB
PostPosted: Mon Aug 06, 2012 8:31 pm 
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Joined: Mon Oct 12, 2009 6:36 pm
Posts: 246
Are you one hundred percent sure the creak comes from your bottom bracket? With Canyon, usually creaks are coming from: dry quick releases, seatpost (remove, regrease, reinstall), saddle rails (add a little bit of oil). When nothing of this fixes the problem, reinstall bottom bracket with lots of assembly paste or grease.
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petromyzon
 Post subject: Re: Dura Ace BB
PostPosted: Mon Aug 06, 2012 9:49 pm 
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Joined: Mon Apr 05, 2010 4:14 pm
Posts: 172
Are the bearings on HollowTech2 setups particularly sensitive to the torque you place on the installation thumbwheel? Put my first set on a bike last week and it occurred to me that I had no idea whether I was doing it to spec or not.
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logy
 Post subject: Re: Dura Ace BB
PostPosted: Tue Aug 07, 2012 8:40 am 
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Joined: Fri Jun 03, 2011 6:30 pm
Posts: 46
It does not creak, but makes a grinding noise when pedalling.
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logy
 Post subject: Re: Dura Ace BB
PostPosted: Tue Aug 07, 2012 4:58 pm 
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Joined: Fri Jun 03, 2011 6:30 pm
Posts: 46
Not the BB! Front wheel bearings are the suspect...
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justkeepedaling
 Post subject: Re: Dura Ace BB
PostPosted: Tue Aug 07, 2012 5:01 pm 
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Joined: Thu Jan 03, 2008 6:14 am
Posts: 1115
Location: by Crystal Springs (Sawyer Creek Trail)
Same thing, you definitely set them too tight. Wore away at the bearing
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Weenie
 Post subject: Re: Dura Ace BB
Posted: Tue Aug 07, 2012 5:01 pm 


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