As the only point of contact between your BMW and the road, it’s vital that your tires deliver excellent handling, cornering, braking, and solid accelerationâ€šÃ„Ã®in a safe manner. So your BMW can perform like a BMW. BMW offers two categories of tires-Run-Flats and Standard Engineered tires or as we know as the Original Equipment or OE tires. Run-Flat tires feature resilient rubber-reinforced sidewalls and heat-resistant rubber compounds. These allow you to continue driving with a punctured tire at a maximum speed of 50 mph for a limited distance. A run-flat tire is a pneumatic vehicle tire that is designed to resist the effects of deflation when punctured, and to enable the vehicle to continue to be driven at reduced speeds (up to 90 km/h or 55 mph), and for limited distances of up to 100 miles (160 km), or even 200 miles (320 km) depending on the type of tire.
There are three basic technologies currently available, described as:
Self-supporting run-flat tires are fairly common on light trucks and passenger cars and typically provide for the vehicle to drive for 50 miles at around 50 miles per hour. However, if the tires are treated to this kind of punishment, they may still be irreparably damaged in the process. In addition, if the tire is punctured in the sidewall or at the edge of the tread, repair may be impossible or unsafe. Self-supporting run-flat tires typically carry a 15% – 27% weight penalty over similar standard tires, or additional 2-3 kg (4-7 lb). The additional mass concentrated on the outer edge of the wheels can impose a significant performance penalty due to greater rotational and unsprung mass.
Self-sealing. These tires contain an extra lining within the tire that self-seals in the event of a small hole due to a nail or screw. In this way, the loss of air is prevented from the outset such that the tire is either permanently self-repairing or at least loses air very slowly.
Auxiliary-supported. Run-flat tire with support ring. In this system, there is an additional support ring attached to the wheel that can support the weight of the vehicle in the event of a loss of pressure. While these systems generally offer better ride quality because their sidewall’s stiffness can be equivalent to a standard tire, the requirement to have both special wheels and special tires increases cost and limits these systems from widespread use. Consult a BMW center to find out if Run-Flat tires are available for your vehicle.
When you purchase tires, make sure that extensive testing has been done to determine which tires are best suited for your vehicle to maximize performance. Only tires that succeed in meeting BMW’s standards for safety and handling characteristics are given the title of BMW Approved tires. And in addition to getting tires with the proper speed rating, load index, and size always make sure that you consult a trained technician who knows your vehicle.