What rims are they?
No name china carbon rims. Bought second hand (unlaced) on eBay. Probably the worst answer I could have given :)
Not the worst answer. Couple of brand name rims form microcracks after rebuilds and its purely cosmetic.
These tho, I would not be so sure.
Have you noticed decrease in tension? Also, has you Mack hub already have play in the bearings?
@Turkish started
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What rims are they?