Track spec SL's are made for 100% track cars. There is a TON of engineering behind it and we make 6 wheels. 1 front and 1 extra rear are made for testing. We reengineer the wheels depending on the application of the car because each and every car has different weights and requires different strong points for the wheel. If you'd like some hard details, please email me at
tony@adv1wheels.com. They Track Spec SL's are really something out of this world. There's nothing like them.