I’ve been to mid wales twice on MTB’s, both times I came back with buggered BB’s (UN52 and 72) and the second time my freehub became completley free!
I’ve got a superstar BB, the original bearings were pap, failed after 8 rides, bought another (why?) and they failed again in about the same time. However the bearings are a standard size, so knocked some SKF ones in (£25 from local transmission shop), being carefull with the top caps (still mangled them but been fine so far.
So far theyve been beeten to pices in Spain, and dragegd through gallons of Swinely mud and have only just loosened up/bedded in!
£20 for the BB
£25 for the bearings.
So far its thoroughly recomended.