Cool idea. After reading a few posts on this forum, I think you are going to get at least a 70% negative response to anything asking about single speed bikes, I don't get it???

In the early days of the Tour de France, the riders had a 47T to 50T on the front and a 15T or 16T on one side and a 19T or 20T on the other side of their rear wheel. I think they did about 250 miles in a single day on a very heavy bike.