fearfactoryüberalles":s0n40l0f said:hamster":s0n40l0f said:I'm puzzled about what you say: the Kooka BB I have uses stock industrial bearings, available from any bearing factor for around £5. Likewise the Shimano UN91 can be repaired in the same way. UN72s seem to last me upwards of 10,000 miles.
I've swapped to Phil Wood and Superstar hubs on my main ride, which take stock bearings, although I had to retire the Hope rear hub on my singlespeed after I bent the axle...but it was 25 years old.
Hmm, could you be a bit more specific about overhauling the bearings on UN91 BBs, please? I've only met with "bearing balls located directly in axle'groove" type Shimano old-school cartridge sq.taper BBs so far, thus redering these parts FUBAR/broken when opened by any special method on earth.
Maybe the UN90 series used generic, removable cartridge bearings?
Exactly as you describe - UN9x series can be dismantled and the bearings swapped, all others cannot.