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I've never ridden a bike with a bottom bracket wider than 68mm.
I've seen some 'bargain' carbon 29ers online...
So what's a 92mm bb like?
Do you feel like calamity Jane when you dismount?
Do your knees hurt?
What make of bottom bracket works best?
Happy new year, btw!
The Q-Factor is the same as with a threaded 68/73mm bb.
This will blow your mind....68mm bb+cups=92mm
(there is still time to delete this thread)
24mm that will change your life
Life will never be the same again.
id be coming from octalink. does that make a difference or am I merely digging myself a bigger hole?
Jeffsy by any chance? I have one (with BB92). I'd rather it wasn't but not that big a deal. First set of bearings only lasted 5 months but have now replaced with Hope ones. Knocked old ones out very easily and got a basic press off eBay.
I have 2 bikes with PF41/BB86/92 BBs - a CX and MTB and both have been fine but do avoid using a 30mm spindle crank. The other to avoid is BB30/PF42 where the bearings are pressed directly into the shell - notorious for creaking and having the bearings sitting in manky water than collects in the BB shell shortens their life.
Just like octalink but more crappier and wont last as long!!
This will blow your mind....68mm bb+cups=92mm
(there is still time to delete this thread)
I'm pleased he didn't - I did not know that 😕
I have 2 bikes with PF41/BB86/92 BBs - a CX and MTB and both have been fine but do avoid using a 30mm spindle crank
Hello. Why?
Jecca bb92 was designed for shimano 24mm spindles you can get bb’s adaptered for 30mm spindles but there is limited choice and the bearings are much thinner to accommodate the wider diameter spindle in the same shell and from experience don’t hold up to muck / wear as well as there thicker 24mm cousins. Also the bb’s for 30mm spindles doesn’t have room to fit a centre tube, just 2 cups and bearings on each side. This further exposing the bearings to water and moisture. Bb92 tends ( not always) to be on carbon bikes, many of which don’t have drain holes, so it can turn into a bit of a swimming pool down there, so the more protection the better, hence best avoid 30mm spindles on 92.
@dovebiker and bigwill
Great replies, thanks!
I've always had my eyes on the DMR 'axe' crankset, but it's got a 30mm axle, so I guess I'll give it a miss.
😕
You can also run GPX cranks , Which is SRAMs equivalent to 24mm
okay, thanks. i thought he had another reason
i've got 30's in 2 bb92 frames with no issues.
i don't get any water in my bb shell, where does the water get in?
Thanks for the contributions folks, very enlightening.
I'll probably just end up with a shimano bb.
The frames on order. I'm looking to build it up as a very light half-fat bike with steel forks (project 2),
I remember now that octalink bb's come in 112/117/122 widths.
Probably the same width as a bb92 once everything's nipped up tight, 😳
Jecca I would image down the seat post or in internal routing ports. My current frame which is pf92 stays pretty dry down there, but my last frame was rank. That said hope bb’s seem to see there way through most situations.
thanks for reply. i have stealth droppers so no water down there and all my internal lines have rubber gromets at the opening. always seems pretty dry on strip down. i also grease the rear of the bearing as it goes in to ward off evil spirits in bb shell
Hopes in one and rotors in the other, i've just cursed myself, creaking knackered bearings next ride. doh!
Re: the carbon frame, hopefully I'll remember to use carbon paste before I slide the alloy seatpost in.
Galvanic corrosion, etc.
Of all the push-fit BB bullshit, BB92 is probably about the best. I'd rather not have it but it's not caused me any real issues. Fitting and removing is simple, lifespan isn't awful imo