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Old 07-12-09, 08:39 PM   #1
mikerhymeswith
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Analysis of Creaking Front Wheel

Please check my analysis of my creaking front wheel.

Wheel is front American Classic hub 24H, CXRay bladed spokes, Velocity Aerohead, built by a pro. It's true and evenly tensioned.

I am 147-151 lb rider.

Creaking occurs when I get out of the saddle for a sprint or climb and the bike is getting tossed back and forth.

Tightening the skewer beyond what should be necessary stops most of the creaking.

I replaced the fork with an Alpha Q and creaking continues.

I replace the American Classic wheel with a Bontrager and creaking stops completely. Skewer tightness is normal. I ran some hard sprints up a couple of short hills to stress it. No creaks.

Examining the difference between the American Classic and the Bontrager I find the AC hub end cap diameter to be smaller than the diameter of the lock nuts on the Bontrager hub. There is a similar difference in the diameter of the nuts of the skewers with the AC nuts being smaller than the Bontrager's.
I find the Bontrager diameter of locknuts and skewers to be similar to other wheels in my collection. This suggests that the AC end caps and skewer nut diameters are smaller in general.

My conclusion is that the smaller diameter of the AC end caps and skewer nuts result is a smaller area of engagement with the fork. Thus the skewer needs more tension to secure the hub to the fork under high stress. Under normal tension on the skewer the hub slips around in the fork causing the creak.

Solution: AC front hub gets replaced.

Comments appreciated. Thanks.
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Old 07-12-09, 08:43 PM   #2
Panthers007
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Have you checked the adjustment on the headset?
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Old 07-12-09, 08:44 PM   #3
brentley
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I have an old rolf Vector Comp front on one of my bikes that always creaks when I am out of the saddle. At some point I will replace it, at this time I just realize it and ignore it.

have you thought about a totally new wheel with regular spokes?
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Old 07-12-09, 09:26 PM   #4
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put a drop of lube on the QR skewer threads.
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Old 07-13-09, 09:28 AM   #5
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regarding.....

- headset adjustment: integrated h/s; top screw tightened to spec. no play or rattle

- considered new wheel: i was thinking about replacing hub and reusing rim and spokes first

- lub on skewer threads: i have 'em greased

rode bike with Bontrager front wheel this morning for an hour; did some hard sprints and hills; not a single creak

thanks for the ideas
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