Will a 32c tire even clear your frame? Lots of fixed gear frames don't have the clearance for tires that big generally.. I think 25-28c should probably be just fine for bombing around Boston -- I've got 25c on most of my bikes for riding here in SF, my road bike has 23c's though. The handling is good, ride isnt squishy but not crazy stiff either. I've always been told that Boston streets are crazy bad so based on THAT I'd probably rock 28c's!