I dunno... You might have the same problem with chain skipping that I did. It seemed to work on the bike stand, but as soon as I put some force into the pedalling, it would skip. I was using a 7-speed chain on shimano 3-speed cogs. The 7-speed chain wouldn't even seat on my SA cogs; the teeth were too thick for the chain.
Sixty-fiver? You've been doing this a lot longer than me...