no, 18x9s will fit up front fine, you can do up to an 18x10 front and 18x11 rear as long as the wheel has the correct offset. Do you want to be able to rotate your tires? if so then an 18x9 on all 4 corners with a 245 40 18 or a 275 35 18 and if you dont care if you rotate and want a wider set up for the rear you have a ton of options as far as tires go but your rims will be an 18x8.5 to 18x9 and your rear will be an 18x10 or 10.5 tire options can be 245 40 18/275 35 18, 245 40 18/295 35 18, 265 35 18/295 35 18. those are the most common. We keep all of them in stock as well as a huge variety of rims to choose from as well. if you have any other questions feel free to give us a ring. 877 859 2571
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Rim size question - 
