The Smart ENVE System optimizes the interface between the frame surfaces and the wheels, creating an integrated system. The front and rear wheels interact differently with the air and the rest of the bicycle. Rim shapes are optimized to allow airflow to stay attached at higher yaw angles, thus reducing drag and improving ride performance. ENVE and Chris King Precision components are American Manufacturers and both companies offer an industry leading 5 Year Warranty to the original owner of the product. ENVE also has a Lifetime Crash Replacement policy available to the original owner.