what's the net weight of a 18x8.5" BBS RK (et13) wheel please? I wanna switch to these wheels with 235/40ZR18 tires (from the stock 15" wheels w/225/60ZR15 Pirelli P6000) but I don't wanna suffer the consequence of increasing the un-sprung weight of the vehicle.
From my understanding increasing the un-sprung weight will give a much bumpier ride, correct?