This is starting to make me a little crazy. I took my '72 Super Course to work last Friday after letting it sit unused for nearly 3 weeks (it was begging to be ridden) and on the way to work I heard, and then felt, a clunking noise coming from the Bottom Bracket. I could feel it in my left foot, I wasn't sure whether it was the pedals or the BB or the Cottered Cranks, but it was fairly loud and could be felt with ever revolution.

Got home Friday Night, checked the cranks for play and thought I felt a little something on the left arm, so I replaced the cotter with a new one and took it for a test. Didn't fix it.

Next I took both arms off, and checked the spindle for play. Again, I thought I felt more than I should. So I repacked the BB using the existing bearings (they were new in March), readjusted the BB, and no a whim decided to repack the pedal bearings as well. Put everything back together and all was well, I did 35-40 miles on it this weekend, and rode it to work Wednesday and Today.

However today the noise was back, and this time it sounds more like a squeak than a thunk, and again I can feel it in my left foot. I don't feel any significant play in the cranks or the pedals...I'm kind of at a loss. A little voice in my head is repeating a mantra saying "You've got Standard Threading, Just go Cotterless and be done with it!"

But i'm hesitant.. I've sort of come to like my cottered cranks.