you're gonna kill low end grunt with the 25s. that's a big tire for a 150. I have my daughter's on 23s right now and don't think i'd want to go bigger -- she runs all flatland, anything hilly and i think you'll struggle and possibly get into clutch/belt overheat problems. Up front different story, less rolling resistance, will smooth out the little stuff more, so no problem going bigger up there.
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