pydo82 said:
Thanks for the input. I am going to consider some m rims too. What width wshould I go with? THe same all around? Are there advantages or disadvantages to a wider rim? I was looking at some MB Italia #11's. 18X8. Only $829 for all 4. Any good?
Advantages and disadvantages, of course!
An advantage of staggered rims (bigger/wider rims in the rear vs the front) is it allows you to run a wider tire in the rear, which gives you better launch and less wheelspin if you step on it (more rubber to the road). It allows more of that awesome bmw engines power to reach the ground. Honestly, (imho) unless you have a 330, or M car of some sort (IE: a big engined BMW) then it's gonna be more of a 'looks' thing than anything. (You won't get much of a performance enhancement from putting staggered wheels on a 325 for instance, but it does look more aggressive!)
A disadvantage, is that you now have 2 different sized tires on your car. Forget wheel rotations, you will eat through tires faster than if you have the same size all around and can get an occasional rotation out of them.
18x8 is a good conservative size (When I say conservative, I mean you won't have to even consider 'rolling' your fenders). 18x8 wheels should support 225 and 235 width tires, which will fit easily and snugly under a 3 series. You can get larger and wider ones on the car, but then you have to consider rolling the fenders, and in extreme cases, a widebody kit.
(I'm running on 18x8's w/ 225/40/18's all the way around).
If you decide to do a suspension upgrade in the future (drop your car), then again the size of your wheels will come into question again. If they are super wide now, you may need spacers in the future or a fender roll to move them out further from the car (to avoid rub in the wheel well). With 18X8's, you should be ok to do any sort of drop you like (Again, it's 'conservative' which to me just means it's what 'should' be on there).
Hope this helps, again just my opinions and discoveries as I've played with my car.