ok, so i have a 2000 toyota celica and the whole car is OEM (original Equipment Manufacturer)...springs, wheels, tires, interior, exterior, everything..and im wondering, do i need springs or shocks to get 18 size rims on it, or can i just buy the rims and just put them in without anything else??
i want these...
http://cgi.ebay.com/ebaymotors/18-Rims-Celica-VW-Golf-GTI-Beetle-Jetta-Audi-TT-Wheels_W0QQitemZ180477303123QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item2a05491953
Cool looking rims, but I would be very careful before buying them on the eBay auction. Some aftermarket rim manufacturers create bolt patterns on their wheels to fit many manufacturers, but that can sometimes lead to minor variations in something that you would want to be sure fit perfectly.
An incorrect fit of your rim/tire package on your car can translate into a vibrating of the steering wheel, especially around 60MPH. It can get a lot worse than vibrations and sometimes lead to more of a shaking feeling at speed or during hard braking/cornering.
But, to more accurately answer your question, you probably would not need to change your shocks or springs, but you could have an issue with the width of the wheel when combined with the correct tire. Sometimes the wider width combined with the larger diameter can cause problems with the tire rubbing when you go over bumps or take sharp turns. That can lead to tire damage and ultimately a blow out.
You should check what your options are with a reputable custom wheel and tire dealer, such as the TireRack.com. I have used them several times in the past. They are not the cheapest, but they typically provide good information on how the wheels/tires would perform on your particular car.
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