I have the 26 X 2 X 1/34 on my 2 speed American, it rides nice and has pretty good speed. I have been actually riding this bike on longer rides lately, and was curious if the 26 X 1 X 1 3/4 tires would help for speed, drag etc? (I have a new set). They are skinnier for sure, and would give the bike a more lightweight look, but a few more MPH and efficiency would be welcomed.