TKPH (ton kilometer per hour) and ton miles per hour are expressions of tire operating capacity and are the maximum internal temperature at which a tire may operate properly.The TKPH of a tire depends on the design of the tire and varies with the type and type of tire.In the process of using the tire heat and tire and speed product is closely related, rubber performance will decline significantly with the increase of temperature, rubber performance will decline to a certain extent will deteriorate sharply, at this time the temperature is the critical temperature of tire use (generally 110℃).TKPH can generally be divided into TKPH rating and TKPH usage.TKPH rating is expressed as the product of consistency and speed when the tire reaches the critical temperature under the ambient temperature of 38℃, which represents the heat resistance and ring breaking performance of construction machinery tires. The higher the TKPH, the better the heat resistance and the longer the service life of the tire.The TKPH rating of the tyre may be tested in practical applications or determined in the laboratory in accordance with the experimental methods specified in GB/T30197.The use of the TKPH value is based on the actual usage scenarios according to the corresponding computation formula and empirical correction data of each manufacturer, comprehensive consideration of the tire load, speed, distance, the actual usage data such as ambient temperature calculated by formula, when use TKPH value below the TKPH rating, indicates that the use of the tire is safe, the opposite tyre face failure and speed up the risk of damage, you need to tire through ascension or reduce the use conditions to improve the quality of the TKPH value of the tires.

TKPH = Qm × Vm
Qm     =  (Qc + Qv) /2
Vm = L * N / H
Qc-- load of each tire at full load, ton
Qv-- the load capacity of each tire under no load, ton
Qm-- average load per tire, ton
L -- Vehicle round-trip distance, take the highest driving route in the class, KM
N-- The number of cycles completed within a working class should be the highest value within a class
H-- The total time in a class
Vm- Mileage per tyre, km/h