Truck Tyre measurement err should be tolerance of 10%. Exploits the difference between the general measurement err of 10% to 33% with the tolerance level of increase the greater the proption of errs that the smaller the tolerance the higher the proption of errs skf impted Truck Tyre tolerance of IT5 me difficult to reach 10%. Measurement err does not mean that 10% of test tolerances can be relaxed but to give some safety margin to ensure that the stard user acceptance.