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2017 Mazda 3 GT hatch
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If you live in an area with lots of potholes and crappy roads, I'd do 225/50R17. If the roads aren't too bad, you can do 225/45R18...it's slightly wider than the 215's that come on the car but fits just fine and doesn't throw off the speedo more than 1-2 mph.
 
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