My sam has developed a weird thing.
There is like a grinding sound at the same point of every revolution of the
crank arm. I removed the chain and confirmed that the grinding sound still
happens, so it appears to be related to the bottom bracket.
Any ideas on what this is?
Bottom Bracket
It sounds as if the bearings have been contaminated. Since you say Sam, I
guess this is a Tange cartridge bb assembly? I've successfully cleaned
cartridge bearings by prying the dust shields aside and flushing the
bearings, either with WD-40 and the little straw, or simply by swishing
them around
