Thanks very much
Press Fit BBs - ok or avoid?
Posted 8 months ago #
Said it before and I'll say it again: if bearings are failing, check how much and what grease they have in them, as most cartridge bearings are more suited to photocopiers than MTBs when it comes to grease.
They may be failing for other reasons, but that would be the first thing I'd check.
My buddy's factory fitted press fit died after 3 weeks of light use and none of the LBS's stocked a replacement - consequently he missed a great day's riding - My.hollowtech bb's have been faultless including a relatively cheap XT one which survived 7000 miles of commuting including last year's floods during which time I regularly cycled through knee deep muddy puddles also I jet washed constantly - it's still smooth as silk .. The only time I'd f##k with press fit is if I got a deal on a second hand frame ..
About a year out of mine which is similar to the Shimano external threaded units (XT), the Hope ones rather longer.
However, have got a new Hope press fit sat on the bench to go in and the tool just turned up, so will be finding out if there are more long lived. Doubtless you could critique the nature of a press fit but as the bearing inner and outer races are held distant from the frame evening if the bearing collapses it shouldn't do too much mischief, save ruining the ride.
It is a bit disappointing that everything is going press fit and not threaded. At 17 st and riding about 200 miles (on and off road) per week i am not sure i can see that there is a user advantage from my perspective. Apart from 'working on a bike' involving a deadblow hammer.
as the bearing inner and outer races are held distant from the frame evening if the bearing collapses it shouldn't do too much mischief,
Actually they can - or at least they can if people don't notice that the bearings have seized and the cups then rotate in the frame, wearing away the BB shell...
Clubber - fair one - could do. On other press fit 'stuff' I've had the bearing collapse and not seize in that manner, yet! ALways a first time.
I heard during a factory meeting last week that one big US brand is going back to BSA next year. The tide may turn yet.
Like sealed cartridge unit BBs and threadless steerer aheadsets, the change was sold to consumers as an improvement but was all about simplifying manufacture and assembly.hmm aren't threadless setups a shedload lighter? Also easier to fit with normal tools, adjust easily on trail if need be and forks are much more interchangeable - if you remember not to cut your forks too short (stem slammers reap what they sow)
My first few mtbs and road bikes had threaded forks and quill stems, I do not regret them being consigned to history, press fit BBs tho, not for me thanks.
Personally I think ht2 are a mixed bag, don't last as long as square taper but are atleast a doddle to fit, give 'em external grease ports and I'd be happy with them.
I heard during a factory meeting last week that one big US brand is going back to BSA next year. The tide may turn yet.Huzzah!
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