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Wear factors

andre71144 said:
I was in the LBS yesterday and and the mechanic had installed cerammic bearing in a bikes bottom bracket and in the wheels. For those of you who have installed ceramics how have they held up. Is this guy going to have to replace these more often, than what came with his factory group.
The places where ceramic bearings (at equivalent specification to steel) offer increased longevity are 1) very high temperatures, 2) very high rpm, 3) corrosive environments. None of these apply for bicycles.
 
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