Cp521 All Season Commercial / Ltr. The CP521 provides reliability, better handling and long tread life for SUV and passenger van. Excellent water drainage and anti-hydroplaning are achieved by 4 straight wide grooves. The zig-zag tread pattern and main groove hug the road for better traction even when a quick maneuver is required. The shoulder design integrates ribbing and a heat discharge function to dissipate heat and improve cornering performance at high speeds. *By request/order.