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A tire-pressure monitoring system (TPMS) monitors the air pressure inside the pneumatic tires on vehicles. [1] A TPMS reports real-time tire-pressure information to the driver, using either a gauge, a pictogram display, or a simple low-pressure warning light. TPMS can be divided into two different types – direct (dTPMS) and indirect (iTPMS).
The Schrader valve is used on virtually all automobile tires and motorcycle tires and most wider-rimmed bicycle tires.In addition to tube and tubeless tires, Schrader valves of varying diameters are used on many refrigeration and air conditioning systems to allow servicing, including recharging with refrigerant; by plumbers conducting leak-down pressure tests on pipe installations; as a ...
A typical direct TPMS (e.g. Ford, [4] BMW [5] or Toyota [6]) comprises the following components on a vehicle: A direct TPM sensor fitted to the back of the valve stem on each wheel; A TPM Warning Light; Unique identifier (IDs) for which tire is providing the data including speed and the direction of rotation; A tire pressure monitor electronic ...
Created Date: 8/30/2012 4:52:52 PM
Take for example a vehicle which had its cold inflation tire pressure set near Denver (altitude 5300 feet), and is descending towards Los Angeles (altitude 300 feet). The tires could become underinflated by as much as 2.5 psi. Cold inflation pressure should therefore be readjusted after any significant changes in altitude.
Replacing a valve stem. A valve stem is a self-contained valve that opens to admit gas to a chamber (such as air to inflate a tire), [1] and is then automatically closed and kept sealed by the pressure in the chamber, or a spring, [2] [3] or both, to prevent the gas from escaping.
The recommended inflation pressure is found in the owner's manual and on the vehicle's tire placard. [3] [4] Because of slow air leaks, changes in the weather and ambient temperature or other conditions, tire pressure will occasionally have to be corrected via the valve stem with compressed air which is often available at service stations.
Most floor pumps, also commonly called track pumps, have a built-in pressure gauge to indicate tire pressure. Electrically-operated pumps intended to inflate car tires (as available in most service stations ) can in principle be used to inflate a bicycle tire if the right type of connection is available.