I'm looking into buying some used rims that already come with tires mounted for $400. THe rims are 17x7.5, offset +45, 5x114.3 bolt pattern but the tires that come mounted are different for the rear and the front. The front ones are 225/45/17 and 2 rear are 245/40/17. I calculated on tire size calculator and it said that the front tires will throw of speedometer by 2% and the rear will throw it off by 3%. Is that okay since its so little or will I have to buy new tires?