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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 05-09-11, 11:50 AM   #1
aeonderdonk
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DA 7800 Bottom Bracket - How long until death?

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.
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Old 05-09-11, 11:53 AM   #2
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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?
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Old 05-09-11, 11:58 AM   #3
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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.
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Old 05-09-11, 01:57 PM   #4
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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.
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Old 05-09-11, 02:06 PM   #5
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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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