The Roto-Grip system from Rud Chain has been used for decades for light and heavy duty commercial vehicles. These chains drop down under the tires and rotate to provide stability to vehicles in winter weather conditions. Chain bundles are manufactured with pre-tensioned springs allowing the chains to lay under the tires like a carpet. The profile of the friction ring is designed to reduce the opportunity for freezing. This rotating chain system is easily serviced with simple replacement parts. Each chain wheel is constructed with square-section chains. These chain systems are best used in hauling, municipal vehicles, fire services, and buses.