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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 03-30-09, 07:08 PM   #1
gerv 
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Bottom bracket analysis

I was working on a Fuji Thrill mountain bike from the late 80s this weekend. I figured the bottom bracket might be toast, but from just spinning the crank, it seemed fine. There was no lateral movement, no grinding noise.

However, I decided to take the crank off anyway and when I did I noticed that the BB sounded like it had sand inside instead of bearings.

Is there a way you can figure this out without taking the crank off?
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Old 03-30-09, 07:26 PM   #2
JanMM
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You can't really tell how it "feels" without turning the spindle with your fingers.
When you got a look inside the BB, was it toast?
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Old 03-30-09, 09:20 PM   #3
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No, but the grease was pretty much gone. I took the bearing cages out and immediately bearings fell out. Luckily I didn't see any scoring on the spindle or the the cups... I replaced with new loose bearings, lots of grease and it seems OK. My guess is that this was the first BB service in 20 years.
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