Great set fits C4 Corvette and various other GM applications. Super-clean polished aluminum wheels: 4.75" bolt circle, 17 x 9.5 x 56 (front) and 17 x 11 x 36 Rear. Mated to BF Goodrich G-Force R1 (P275/40ZR-17 and P315/35ZR-17). Competition heat cycled by Tire Rack. Used one session before the 'Vette gave up. Perfect track set up. Minneapolis area.