Ive noticed that on the Z and even BMW's that the rear wheels tip inward at the top. Ive noticed this on my Z even more now that I went to a wider rear wheel (10.5")? Will the rear tires wear faster on the inside?
thanks,

 

it's called negative camber. Yes it will cause your tires to wear out quicker on the inside.

 

Yeah, when I mounted my 9.5/10.5 wheels, my camber went even more negative than it normally had. I had the SPC camber/toe bolt combo installed at the rear and am waiting on the new SPC front camber arms to be delivered. My car is a daily driver, so I didn't want my new tires wearing out any sooner than needed.

 

Some neg camber is good! When you corner hard the tire contact and angle will hold the road much better that if you had 0 camber. Stock specs on most sport(y) cars have some neg camber.

 

Thanks for the replies! I did a search for negative camber and it seems like the consenses is that you do not need to adjust camber for a wider rim and tire setup, but you would if you lower it.

 

How come the fronts don't use negative camber? Or do they?

 

Correct. Changing wheels should not effect alignment.

 

Yes. About -1 degree. Racers run -1 to -3 degrees of camber.

 

lol...it's negative camber, MANY high performance rear drive cars are setup up mildly negative from the factory for better left/right rear stabilitiy

 

changing wheels DOES change your alignment, as it alters how the tire contacts the road. As you alter the location of the wheel relative to the hub of the car, alignment will change

How much it changes it depends on your tire section width, and the offset/width of the wheels you install

 

I went with Tire Racks recommendation (they are usually conservative, I went with :18x9 +31mm offset in front and 18x10.5 +43mm offset in rear.