Bicycle Mechanics - DA 7800 Bottom Bracket - How long until death?
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05-09-11, 12:50 PM
So it looks like my BB is going, or so I assume. About every 2nd full crank revolution I can feel a click/hitch in the BB. How long for this world do you think it is? I've ordered a replacement but wondering how I can keep riding on it until it NEEDS to be replaced and what adversely may happen if I ride too long on it?
Sorry for being a n00b.
05-09-11, 12:53 PM
How many miles on the BB and has it seen any rain? Also is it possible that your non-drive side crank is loose or that the cups are not tight in the frame?
05-09-11, 12:58 PM
I bought the bike used so I'm not sure. It's seen about 2500 miles from me, and probably anywhere from 2-10k miles from previous owner.
I suppose most anything is possible, I can check for tightness of the arm/cups.
05-09-11, 02:57 PM
The newer external BB's are not as durable as the original square taper cartridge types. I have replaced them for friends, but I don't know much milage they got from them.
You can ride it until the noise drives you to replace it without damaging the crank.axle.
05-09-11, 03:06 PM
You can pull them, pop off the seal, flush them out, lube and reinstall. Make sure you grease the shaft where it contacts the bearings before installation.
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