After installing and driving about 100 miles I have to tighten the bottom bracket as there is a lot of play, then another 100 miles these balls are gone, the locking rings are already in pieces broken. Same problem happened to all 10 pieces, each pair can only do 200 miles in a week. I think the broken parts of the ring also scratched the bottom bracket cover and the axle surface so I have to replace everything.
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