I have a real technical question maybe anyone can help me answer. I was thinking of running Rota p45r 18x9.5 wheels on my evo using a +20 offset in the front and +30 offset in the rear.
If i go all +20 offset the rear wheels will be very aggressive and may rub. If i go with +30 offset on all 4's i will need an 8mm spacer and extended studs in the front. Would a +20 offset in front and +30 offset in rear work without any major/minor drawbacks in driveability or function?

 

It should be fine. There's no issue with running different offsets front and rear unless you want to rotate the tires.

 

I'm probably wrong about this, but wouldn't rotating tires on a 50/50 awd system be pointless?

 

Offsets have nothing to do with tire size. Well, not directly at least. You can still rotate the tires, but you'd have to have them changed from wheel to wheel.

The front and rear tires will wear differently because of the fact that the front tires are used for turning as well as moving the car forward. Also, the alignment settings are different for front and rear. Depending on how you drive the car, and what your alignment settings are, you may or may not benefit from rotating the tires.

I'd go with +22 all around.

 

Or get same offset and use spacers where needed (not my top choice). I'd rather have 4 wheels that fit without spacers.

Yes, you still must rotate tires on AWD.

 

This is exactly what I meant...

I run different wheel widths front and rear on my race car (wider in front), so I know how much of a pain in the *** it is when you want to rotate tires.