The big disadvantage to support ring systems is that their unique wheels do not accept standard tires and the resulting lower volume offers consumers fewer tire choices. In addition, because the sidewall stiffness can be similar to standard tires, auxiliary supported systems can offer better ride quality than self-supporting tires. The advantage of this system is that the wheel usually doesn’t wear out or need to be replaced. This puts most of the load on the wheel, rather than the tire. The flat tire’s tread rests on the support ring attached to the wheel when the tire loses pressure. The tire is attached to a special rim that employs a ring, typically made of hard rubber, that can support the vehicle’s weight in the event of air loss. Support ring run-flat tire systems combine unique wheels and tires. Auxiliary Supported Systems Indicates self-supporting run-flat tires These tires also feature specialized beads that allow the tire to grip the rim even in the event of air loss.Įxamples include Pirelli RFT (Run-Flat Technology), Yokohama Run-Flat and ZPS (Zero Pressure System), Dunlop DSST (Dunlop Self-Supporting Technology) and ROF (Run-On-Flat), Firestone RFT (Run-Flat Tire), Goodyear EMT (Extended Mobility Technology) and ROF (Run-On-Flat), Kumho XRP (Extended Run-Flat Performance), Michelin ZP (Zero Pressure), and Bridgestone RFT (Run-Flat Tire). Manufacturers typically attach rubber inserts next to or in between layers of heat-resistant cord in the sidewalls to help prevent breaking the reinforcing cords after the loss of air pressure. This type of run-flat tire has stiffer and tougher rubber, which can temporarily carry the weight of the vehicle under lower, or even zero, tire pressure. There are two primary types of run-flat tire systems: the self-supporting system and the support ring system (also called the auxiliary supported system). Driving slower does not extend the range the maximum is 50 miles at zero pressure at a speed not exceeding 50 mph. Most manufacturers allow continued operation after a loss of some or all inflation pressure for up to 50 miles at a maximum speed of 50 mph.
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