opinion to stay with 17" or get 18"

need your opinion guys...i currently have 17" adr rims on 215/45/17 but getting a good deal for a used set but excellent condition 18" motegi on 215/35/18 for $300.need to make decision by tommorrow noon.don't know if this info would help but i am using eibach pro-kit with tokico illumina.what do you think would be the ride with 18" on?thanks in advance!!!

Especially the size height and width, if you don't already you'll almost certainly have rubbing problems in your wheel well(s). I have 16x7 wheels running 215/45 tires and I get rubbing if my steering wheel is turned full lock in either direction, or if I corner super hard such as on the track, then I'll get wheel rub from the front fender. Another thing to consider is weight... The bigger the wheel, then generally the more the combined package of it and the tire is going to weigh. This is particularly true when you factor in rotational mass and unsprung weight (any weight supported by your suspension but below or hanging from it). Figure for every pound of wheel/tire weight, add 7 pounds per static pound once the wheel is in motion. So take a 10 pound wheel. It now essentially through rotational inertia, weighs 70 pounds. That's 280 pounds right there when the car is in motion. Upsize your wheel and say add 5 pounds per wheel. That's now 1-5 pounds per wheel in motion for a total of 420 pounds. See how fast it can multiply? Figure that "18 Motegi wheel weighs about 20 pounds if not more... Do the math and you'll see how much that can hold the car back, both in acceleration, braking and also cornering just because you have that much more weight to sling around. Of course this is all relative to the speed you are traveling at, but it's a good general rounded figure amount to go by.

yeah... what he said....