Bicycle Mechanics - BB question
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02-07-09, 02:30 PM
So I went on slow casual 20 mile ride, mostly because it's raining and I hate riding fast in the rain.
But anyways I noticed when mashing or really pushing hard on the pedals I get kind of a knocking noise from the BB area. Only happens on the downstroke of the right pedal. So I took it to my LBS (still under 1yr warranty) and he said it sounds like the BB. So I told him I'd drop it off Monday.
So the question is, what could cause this? Something catastrophic to the frame/BB/crank? I didn't see any cracking around that area. Never been in a an accident. I'm guessing something wrong with the BB, but what in particular?
02-07-09, 02:42 PM
It may not be from your BB. It can be from many places - as this will show you, and help you diagnose and eradicate the problem:
02-07-09, 02:49 PM
BB typically refers to the cartridge (spindle & bearing assembly), not the shell/frame. Nothing catastrophic.
02-07-09, 03:38 PM
Thanks for the link. Based on sheldon's page I checked off everything I've already done.
Pedals: not loose, they actually tightened them when I got there just to make sure.
Crank Fixing bolt: wouldn't know, don't have the tool, never been removed
Stack bolts: have been properly torqued by me every time I remove them to clean the chainrings and the rest of the drivetrain
Bottom Bracket Cups/Retaining Rings Loose: don't have the tool, don't know, never been removed
Pedal Problem: spin fine, nothing wrong with them.
Bent Chainwheel: nope
Front Derailer Hitting Crank: I keep my drivetrain properly adjusted (plus this is more of a knock not a rubbing of the chain or metal on metal hitting)
Saddle Creaky: No, still happens when I mash out of the saddle
Definitely not coming from the handlebars, I can actually feel the knocking when I pedal hard. It also happens when I'm in saddle light grip on handlebars and really pushing it. Also have ridden no-handed on the trainer to check as well.
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