We recommend running a 20X11, 20X12 fitment on the GTR. R888's make a perfect fitment for this - 285 fronts, 315 rears. The exact weight is going to be dependent on the offsets and spoke design you select but with the SL configuration it's shaving about 2-4lbs off the normal weight of the wheels. I'd expect mid to low 20's for a setup.