Data representing a ground contact time of a tire is transmitted from a tire side device, and received by a vehicle side device to calculate the ground contact time of the tire, to thereby calculate a ground contact length of the tire at that time. In a situation where a tire air pressure may change such as a tire exchange, the ground contact length at that time is set as a reference ground contact length, and a determination reference value is set on the basis of the reference ground contact length. As a result, the relative determination reference value corresponding to the tire type can be set, and a variation of the reduction rate of the tire air pressure when it is determined that the tire air pressure is reduced can be reduced. As a result, the reduction in the tire air pressure can be detected with high precision regardless of the tire type.

Systems for detecting and monitoring tire pressure and temperature during a tire repair or replacement procedure are provided. The systems are configured to communicate a warning signal to a plurality of individuals (e.g., tire maintenance personnel) upon the tire pressure or temperature exceeding a defined threshold (e.g., upon the tire pressure or temperature entering a dangerous range). The system generally includes three categories of components, namely, components associated with a truck (or large work machine) and the tire being analyzed; a tire handler component; and a device that is worn (or held) by tire maintenance personnel, with such components being configured to wirelessly communicate with each other.

A tire characteristic determination system is disclosed. The tire characteristic determination system includes a memory device that stores tire-engaging data related to one or more tire-engaging value to be utilized for spatially manipulating a tire about a wheel for forming a tire-wheel assembly. The tire characteristic determination device includes a tire-engaging test probe that is urged adjacent the tire at one or more tire displacement distances or is urged against the tire with one or more amounts of urging forces. The tire characteristic determination device is communicatively-coupled to the memory device for communicating the one or more tire displacement distances or the one or more amounts of urging forces to the memory device.

The invention is directed to a valve stem system (1) for tubeless wheels. The valve stem system (1) includes a valve stem body (2) with a first end (3) and a second end (4), wherein the second end (4) is located in a tire/rim-volume when mounted at the wheel. A first valve element (5) is arranged at the second end (4) of the valve stem body (2). The first valve element (5) is a self-sealing one-way valve. The invention further concerns a probe (30) for a valve stem system, a method to test the amount of sealant in a wheel and a refilling assembly (80) for a wheel.

Data representing a ground contact time of a tire is transmitted from a tire side device, and received by a vehicle side device to calculate the ground contact time of the tire, to thereby calculate a ground contact length of the tire at that time. In a situation where a tire air pressure may change such as a tire exchange, the ground contact length at that time is set as a reference ground contact length, and a determination reference value is set on the basis of the reference ground contact length. As a result, the relative determination reference value corresponding to the tire type can be set, and a variation of the reduction rate of the tire air pressure when it is determined that the tire air pressure is reduced can be reduced. As a result, the reduction in the tire air pressure can be detected with high precision regardless of the tire type.

A system, which is structured to evaluate a condition of a tire, includes a housing, a tire-wear detector, a tire-presence detector, and an electronic activator. The housing, when the system is deployed, is placed on a ground surface. The tire-presence detector detects a presence of a tire on the housing. The electronic activator activates the tire-wear detector when the tire-presence detector detects the presence of the tire on the housing. The tire-wear detector, when activated, detects a wear condition of the tire when the tire passes over the housing.