The ZL1's power is complemented by exclusive performance technologies, including the third generation of Magnetic ride suspension and Performance Traction Management. Brembo supplied the braking system having six piston calipers at the front and four piston calipers at the rear. A duct system delivers air from the grille to the hard-working rotors. The 20-inch forged-aluminum wheels are fitted with second-generation Goodyear Eagle F1 Supercar tires (size 285/35ZR-20 at the front and 305/35ZR-20 at the back). Damping is provided by Magnetic Ride Control units. This system can sense the need for a damping correction 1,000 times per second and make that change in only five milliseconds. The Performance Traction Management (PTM) system was originally engineered for the Corvette ZR1. In addition to modulating engine torque for optimum launch performance in manual-equipped ZL1s, PTM also varies the traction control and suspension damping as needed. The five available modes are for wet, dry, sport with or without stability control and race-driving conditions.