It's not a squeak. It's similar to the sound you hear when the crank arm hits the chain stay. It's consistant at the same position and only every other revolution. I swapped the pedals to no avail. I lost my chain ring wrench so I'm unable to swap out the chaing ring. I'm awaiting one on order currently. The BB is about 13 yrs old PW that was repacked/cartridged about 5 years ago. I see no crack's in the crank arm or chain ring. Chain ring is also on the 13 year side of age. Cranks are Sugino75's and are 13 years old now. Driving me nuts and I'm not taking it on any rides until I fix this for fear of it causing major damage.

The chain is a wippermann 1/8th thats about 5 years old by only 2 years of usage. This thing has yet to stretch on me but maybe it's about time to replace? It's the first wippermann i've used so I don't know the life cycle of one of these guys.