A TD wheel refers to a type of safety wheel designed with run-flat properties, typically featuring a TD rim. In the event of a puncture, this type of wheel allows for continued driving for a limited distance at a reduced speed.
The term “TD” stands for “Two-Dot,” indicating the presence of two grooves running around the circumference of the bead seats of the rim. These grooves are intended to accommodate special extended bead toes found on run-flat tires.
In case of tire deflation, the reinforced bead toes are securely held in place by the grooves, preventing the tire from slipping into the rim well. This design feature enables the vehicle to be driven for up to 20 miles at a maximum speed of 40 mph after a puncture.
The dimensions of both the tire and the rim are specified in millimeters to prevent the fitting of a normal tire to a TD rim or vice versa. For example, a rim marked as “150 TD 365” would indicate a rim with a width of 150 mm and a diameter of 365 mm, specifically designed for use with TD tires.
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