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holy thread hijack.

Mike_arnold. If you go with a bigger wheel you should proportionally go with a tire that allows the rotating diameter to be the same as the stock wheel and tire.

Everyone is saying upgrade your suspension, if you were to put bigger diameter tires/wheels on it then yes MAYBE get suspension if you would like as they will limit the suspension travel. If you keep the tires/wheels diameter together the same then you won't need to worry about it. But try to keep as close to stock as possible.

And about body roll, if you get excessive body roll it may be shown more prominently by softer struts. However, If you were to change your Caster and Sway Bar you would effectively combat the motion from the start not relying on your struts to combat the forces.
 

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If your running 18s on a spectra im guessing your not lowered correct. Cause if you used lowering springs using 18s you gonna rub mad. Unless you get 1000$ coilovers... Or adjustables..
How are you certain he is going to rub? Stock tire rim size is 195/60/r15 Correct? With 225/30/r18 your tire is actual going to have a smaller rolling circumference than stock..... If he was using something like 225/45/r18s then the diameter would be larger and rubbing could occur. If you do your math you can get away with quite a bit, sure if you lower a car it may rub with stock wheel/tires and the 18/tire combo but they are the same circumference. Just because a rim is 18 doesn't mean that the circumference of the wheel/tire is automatically larger, it's completely dependant on the size relationship between the rim and tire. so if that is a problem I'de suggest rolling the fender. Messing your tire size up will funk with your odometer and Speedometer, not marginally but it still will.

Here this might help you guys out figuring out tire sizes that are the same diameter to stock wheels. Tire size calculator
 
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