Hi Bill, The double speed is cool. I had a similar set up with a 45/42 chainrings and I don't remember in back. What rings/cogs are you running? It is so quiet and smooth and I still have a tired/windy day gear if needed. Was on a Miyata I just harvested other parts on, will to go on the 82 Trek mid trail bike I have been running single. Cool builds both actually, Tom Palmer, Twin Lake MI
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