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How do I know when my BB is shot ?(3 posts)

How do I know when my BB is shot ?alchemy
Dec 30, 2003 12:16 AM
Will it be really obvious when my Ultegra BB has reached the end of the road ?

I've done about 12,000 km's on mine and there's a slight whirring sound when I turn the crankset but apart from that it seems fine. Is there a simple test I can do to check it?

What sort of life should you get out of the Ultegra unit if the bike is ridden on pretty good roads, cleaned regularly and never ridden in the rain ?
re: How do I know when my BB is shot ?Mike Tea
Dec 30, 2003 4:32 AM
Drop the chain off to the inside and spin the cranks. Do you hear noise? Can you feel roughness? Is there free-play when you wiggle the cranks? If you can answer yes to any or all of those then the BB is shot.
yes, and that is in increasing order of seriousness.dr hoo
Dec 30, 2003 5:29 AM
"Do you hear noise? Can you feel roughness? Is there free-play when you wiggle the cranks?"

BBs progress through those stages when wearing. First noise, then roughness you can feel, then free play.

Also, the best way to listen to the BB is to put your ear on the frame when spinning the cranks. Make sure to spin the crank and then let it spin, not turn it by the pedal. That way, with the chain off, you totally isolate the motion to the BB.

Fresh BBs make a smooth, kinda "whooshing" sound. It's a very nice sound to hear.