Dura Ace BB

Discuss light weight issues concerning road bikes & parts.
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logy
Posts: 112
Joined: Fri Jun 03, 2011 6:30 pm

by logy

Anyoneknow why my Canyon CF should chew through a BB in 3 months?

by Weenie


justkeepedaling
Posts: 1340
Joined: Thu Jan 03, 2008 6:14 am
Location: by Crystal Springs (Sawyer Creek Trail)

by justkeepedaling

Chew through as in the bearings? Could have been set too tight

logy
Posts: 112
Joined: Fri Jun 03, 2011 6:30 pm

by logy

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
Shop Owner
Posts: 277
Joined: Fri Jun 22, 2007 8:14 pm
Location: UK

by breezerboy

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.

daj
Posts: 246
Joined: Mon Oct 12, 2009 6:36 pm

by daj

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.

petromyzon
Posts: 258
Joined: Mon Apr 05, 2010 4:14 pm

by petromyzon

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.

logy
Posts: 112
Joined: Fri Jun 03, 2011 6:30 pm

by logy

It does not creak, but makes a grinding noise when pedalling.

logy
Posts: 112
Joined: Fri Jun 03, 2011 6:30 pm

by logy

Not the BB! Front wheel bearings are the suspect...

justkeepedaling
Posts: 1340
Joined: Thu Jan 03, 2008 6:14 am
Location: by Crystal Springs (Sawyer Creek Trail)

by justkeepedaling

Same thing, you definitely set them too tight. Wore away at the bearing

by Weenie


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