Run-Flat Tires
A run-flat tire consists of a self-supporting tire, a specially
designed wheel, and a flat-tire monitor that displays a
warning when a flat tire is detected. Depending on the
load of the vehicle and the type of tire, run-flat tires can
typically be driven for about 100 miles (160 km) at up
to 50 mph (80 km/h) even with the tire
deflated.
The sidewalls of these tires feature supplementary reinforcement
belts manufactured in a special, heat-resistant
rubber compound. This design allows the deflated tire to
cover the specified distance without compressing against
the wheel's rim flange. The contribution provided by the
specially shaped safety rim ensures the tire remains securely
seated (Figure 42-13). Together these two features
allow the driver to continue traveling without
installing the spare tire.
Warning
Special rim clamps must be used for mounting run-flat tires.
The flat-tire monitor uses the rotation rate of each tire
as its index for detecting pressure loss; the reduction in
rolling radius that accompanies pressure loss production a
change in the tires rotation speed. The ABS wheel speed
sensors monitor rotation rates of each wheel. If there is a
pressure loss, the system tums on a warning lamp. on
some vehicles, a graphic will display which tire is flat.
Safety tires are labeled on the tire sidewall with circular
Symbol containing the letters “RSC.” Safety tires
Run-Flat Tires
A run-flat tire consists of a self-supporting tire, a specially
designed wheel, and a flat-tire monitor that displays a
warning when a flat tire is detected. Depending on the
load of the vehicle and the type of tire, run-flat tires can
typically be driven for about 100 miles (160 km) at up
to 50 mph (80 km/h) even with the tire
deflated.
The sidewalls of these tires feature supplementary reinforcement
belts manufactured in a special, heat-resistant
rubber compound. This design allows the deflated tire to
cover the specified distance without compressing against
the wheel's rim flange. The contribution provided by the
specially shaped safety rim ensures the tire remains securely
seated (Figure 42-13). Together these two features
allow the driver to continue traveling without
installing the spare tire.
Warning
Special rim clamps must be used for mounting run-flat tires.
The flat-tire monitor uses the rotation rate of each tire
as its index for detecting pressure loss; the reduction in
rolling radius that accompanies pressure loss production a
change in the tires rotation speed. The ABS wheel speed
sensors monitor rotation rates of each wheel. If there is a
pressure loss, the system tums on a warning lamp. on
some vehicles, a graphic will display which tire is flat.
Safety tires are labeled on the tire sidewall with circular
Symbol containing the letters “RSC.” Safety tires
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