Not sure if this is the optimal place to post this, but I'm getting some Panaracer T-serv Protex tires for my around-town bike. Basically, I'll ride on back roads, side walks, and occasionally a dirt trail. I was originally going to get two 700x32 tires, but I was thinking of maybe getting a 700x32 for the front and a 700x28 for the rear. Would that be a bad setup? I thought it might give a little extra speed, while still absorbing bumps fairly well.