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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?
 

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Speed is determined by sensors in the tranny, so the speed will only be off according to the front ones, but what may, not sure on this, may be a problem is the different rotation speeds on the wheel sensors that are read by TCS, I don't know if the3y will be so far out to creat false slippage readings by TCS.
 

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In this case it is such a small amount that unless the TCS system gives you crap then it should be ok, but will look a little strange with the smaller on the back.
 
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