I ride my SS more. just accept the fact I'll be on it 10 minutes more. It's pretty quick still and since the OP is going to ride his solo, he shouldn't really feel a difference too much for speed. That is I don't even though I'm slower & know it. The GI of the single speed still work my lungs and legs while still being fast enough. That leg & cardio work translate to riding every bike I have in better shape. ATB, SS & touring bike. The one bike that I see very little or feel no gain at all is the 20" bmx, probably because it's a neighborhood and trail bike that I'm standing up on regardless of where I ride it. My back usually fatigues before anything else and I wind up stopping and stretching. The bmx is slow, but I'm off road for the most part and that's going to be slow going anyway.