Which tire size would you run?

245/35/20 or a 235/30/20 for the rears ( I already have access to them)...
Wheel's a 20x9.5. The effective offset will be ~+20 or +25 on a 2GS.

why not 225/35 :D

235/30 would be my choice

So 235/30 rear and 225/35 front?
Suup David that's u right :p

up to u bro... if u need that clearance

Yup, whatever you need fr clearance. Its not like you're gonna get much of a strech with those sizes on 9.5" wheels. Get those tires mm to the fenders and 1/4's and you'll be golden :biggthumpup: