From the Chevrolet ZL1 page,,,,, Only the 5 spoke design list being 11lbs lighter than the SS model.
ZL1 offers two 20-inch wheel options, both tested and engineered to the highest standards.
The first wheel option is a 10-spoke design
Standard 10-spoke wheel is black with a low-gloss clear coat, forged alum and has the CAMARO logo.
The other wheel option is a 5-spoke design:
Forged Aluminum 5-spoke 20-inch wheels (20" x 10" front / 20" x 11" rear)
Polished face with a high-gloss clearcoat.
These wheels are 11 lbs lighter than the current 2SS model wheels.