Hi all, I got this clicking sound that drives me batty. Every pedal stroke with a load produces a clicking sound. No sound when freewheeling, or when spinning in really low gear slower than bike's movement. I have replaced the pedals, overhauled the rear hub, replicated it pedalling standing up. There doesn't seem to be any play on the bottom bracket. Chainring bolts and crankarm bolts are tight. No play noticed on the freehub or cassette. It doesn't seem to be the chain hitting the front derailer cage cause it happens on all gears as long as there is a load on the pedalling. Rims are true and properly centered on the frame, with adequate space on the chainstay and tire. There was no change in hardware or work done that seem to have induced the clicking. The weird thing was, the clicking disappeared momentarily after pedals where replaced, or when rear hub overhauled, or when the chain was cleaned and oiled. All those work where done at different times to isolate the issue. The bike is an refurbed 72 Schwinn Super Sport with modern components. The frame doesn't seem to have any damage, no play noticed on the bottom bracket adaptor or the UN54 BB. Bolts seem tight on the rear derailer hanger, adaptor claw and pulleys. The cranks, F/R derailers are modern Alivio's, KMC 8 speed chain, SRAM 8 speed cluster, shifted by Ultegra bar-ends. My next step might be to swap chains, but that might screw the wear pattern on the cogs. And I'd rather not have to by a new BB if it turns out its not that. Any other spots that I might be missing?