the noise is similar to the sound a coke can makes when crushed, and seems to be coming from the BB area although it is hard to tell with these things. i had the cranks off last night and the bearings in the BB are fine, cleaned everything up and refitted cranks for a test ride this morning but the noise persists. i'm not really sure what elsen to check for, the noise only happens when i'm out of the saddle and it doesn't feel 'smooth' to pedal?? 
help please! tia

help please! tia
