Thank gawd for the search option, I was just thinking about this today. Currently I'm running 700x32's front & rear and have been thinking about trying 35 up front and keep the 32 on the rear. On my 7.5 mile commute to work it's on pretty rough pavement that hasn't been redone in some time. The ride home however is much nicer as that side of the highway was re-paved last year. One concern is I don't want to carry 2 different size spare tubes so I've considered running the 32 up front & 28 in the rear. Are there tubes that fit 32-35? I really want the 32/35 as it seems that would provide more benefit than 28/32, yes or no? Will 1 tire size up or down really make a difference? Perhaps a 28 rear & 35 front might be better & just carry the extra tube?