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I just bought a WH-6800 wheelset, and the dust cap was rubbing on both the outside and inside of the hub shell because it wasn't properly set at the factory. I have done a few searches, and this seems to be a somewhat common problem.

Luckily, there is an easy fix:

1. Pop out the front axle assembly. Be careful not to disturb the bearings when you pull out the axle. If there is enough grease, they'll stay in place.

2. Turn the axle assembly so that the left side is facing up and the side with the cone and dust cap is resting flush on your work bench (vertically).

3. Take a large adjustable/Cresent wrench and adjust it so that it fits over the dust cap and comes close to touching the cone (but not quite). The Crescent wrench will now be perpendicular to your axle assembly.

4. Gently, but firmly, tap the top of the adjustable wrench with a hammer. You will see the dust cap "settle in." It doesn't have to move very far--maybe only a millimeter or less.

5. Reassemble hub and set the bearing preload as you wish.

For me, this totally removed any extra friction from the dust cap, and there is now a ~1mm gap between the dust cap and the hub shell, whereas before it was flush with the exterior of the hubshell and rubbing.

The best thing about this fix is that it doesn't require you to file anything or add spacers (others have tried these two methods, among others, to address the problem, with varying, mostly mediocre, results). Trust me, this fix will work!
 

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So you basically defeated the advantage of a dust cap by creating a 1mm gap. I hope you ride in a sterile environment.
 

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In another thread a little further down, he says that his procedure set the dust cap where it was originally intended to rest by design. I'll hold off judgement until I can look at the real thing next week.
 
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