Hate to say it but all of my bikes have triples, and all of my mates have aswell. The only Bike I had trouble with was the Tandem. I changed one Chainring as It was worn and it was not set at the same spacing from the crank as the others. For some reason I tried to adjust to this new chain ring and only solved the changing problem when I got 2 more chainrings of the same manufacturer. Not saying this is the problem but is the space between the small and middle ring- the same as the middle to Large ring. I have now realised that I could have spaced out the "New" Chainring with spacer washers to get the right spacing and these are only 0.01"---- 10/1,000 of an inch.
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How long was I in the army? Five foot seven.
Spike Milligan