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QUOTE (RabidTRD @ Apr 24, 2012 - 11:44 AM)
>A long as he keeps the tire size to meet OEM diameter, doesn't matter how big the rim is
yes and no..... the larger rim puts a larger percentage of weight further from the axle, increasing moment of inertia. hard to explain, but think of a figure skater; with the arms out they spin slower, arms in and they speed up. With the same input rotational force, putting more mass toward the center will make it easier to spin.
I'm sure there is some loss in the 15" to 17" wheel. I have some cheapo 17's on my car now, i don't notice much change, and even though the outside diameter is the same 215/40R17 to the stock 15" size which keeps my speedo right on, you can't get an 18" rim with the same OD as the stock 15" size. So, the larger tire is going to do two things, increase moment of inertia.... AND effectively gear the car up. normal driving you'd likely not notice much difference, but if you compared track times, the smaller wheels win.
My concern is that I didn't want to take the "fun" out of the beams with 18" rims by hurting it's acceleration too much from heavy oversized wheels even though they look outstanding on the car
Getting back to the thread, The reason I asked Timmy about your current wheels is I couldn't tell if they were 17's or 18's. In any case they look good, but if they were 18's I was hoping you could shed some light on how maybe the car felt different after 18" addition.
In any case, I think any of the above choices will flow NICELY with your car
