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What causes it? Any way to prevent it? At the nipples I'm through the anodization on both sides of the rim. Between the nipples anodization is intact. The spokes feel looser than those on the clincher rim set (Open 4 CD) where the anodization wear has no pattern. Not drastically looser, just enough to notice.
 

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wheelbuilder
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Common pattern. The rim deforms slightly under tension. My GP4s have the same thing as to all alloy, box section tubulars I've seen with a dark anodizing on the brake track.

-Eric
 
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