Important: * We strongly recommend that the chains be fitted to the tire prior to actual use to ensure proper fit. Tire sizes may vary because of age, manufacturer, tread or type. * Super Z8 meets and exceeds all SAE Class āSā clearance requirements (15.00mm). Super Z8 has been developed to operate with only 8mm of clearance required at speeds of no greater than 30mph/50Kmh. Once the chains have been installed, drive a short distance.