Just configured my model 3 with base wheels and would like to confirm if I can go with aftermarket 19X8.5 wheels with +30mm offset. I understand that the 19" sport (Stiletto) wheels are +40 offset and 20" sport wheels are +35mm offset. Thanks.
You should be ok. +30 offset will only stick out +10mm compared to stock wheels. Wheel Offset Calculator | 1010Tires.com Discount Online Tire and Wheel Store Inner Clearance: 10mm more (the inside of the wheel to the strut housing) Outer Position: EXTEND an extra 10mm (position of the outside edge of the wheel)
my wheels are 19x9 instead of 19x8.5 but gives you an idea at +30 offset The car is also lowered in this pic, but at stock height is closer to being flush, but not 100%
It will work great and look better but I think efficiency is much lower with less offset. Those little ducts on the sides of the bumper no longer work to direct air around the wheel. At least that's my theory.