I am runing a set of 17" on my dart. Right now the tire size is 235/45R17. I will be going up to size 245/50R17 next time. Plenty of room. Here is a web site that breaks down all of the tire measurements. It has really helped me find the right tire sizes for all of my vehicles.
TireSize.com - Compare Tire Sizes, Specs, Prices & more
pics of my car before with 14" steel wheels, and after with the 17" wheels.
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