BS ISO 10191:2021 pdf download – Passenger car tyres — Verifying tyre capabilities — Laboratory test methods.
5.1.1.2 Maintain the tyre and rim assembly at an ambient temperature of not less than 35 °C for at least 3 h. 5.1.2 Test procedure 5.1.2.1 Readjust the inflation pressure to the value specified in Table 1 immediately before testing. 5.1.2.2 Mount the tyre and rim assembly on a test axle and press the tyre radially against the outer face of the test drum. 5.1.2.3 During the test, the ambient temperature, at a distance of not less than 150 mm and not more than 1,0 m from the tyre, shall be at least 35 °C. No provision shall be made for cooling the tyre during the test. 5.1.2.4 Conduct the test, without interruptions, at not less than 80 km/h test speed with loads and test periods not less than those shown in Table 2.
5.3 Strength test The strength test shall be performed pursuant to ASTM F414-15. 5.4 Bead unseating test (of tubeless tyres) The bead unseating test of tubeless tyres shall be performed pursuant to ASTM F2663-15. 6 Requirements for tyres with diagonal or bias-belted structure and for T-type temporary-use spare tyres 6.1 Test sample Two or three tyres with identical characteristics, e.g. size designation and service description or maximum load rating and speed capability, shall comprise a test sample: a) one tyre shall be used for the endurance test; b) a second tyre shall be used for the high-speed performance test; c) for tyres with diagonal or bias-belted structure, a third tyre shall be used for the measurement of bead unseating, if applicable, and then of strength. The inflation pressures, loads, speeds and durations shall be as specified for each test method. Each test sample shall conform to the requirements specified in 6.2 to 6.5. 6.2 Endurance test 6.2.1 When a tyre has been subjected to the laboratory endurance test specified in 5.1, using a test rim and a valve that undergo no permanent deformation and allow no loss of air, there shall be no visual evidence of tread, sidewall, ply, cord, inner liner, belt or bead separation, chunking, open splices, cracking or broken cords. Notwithstanding the above, PTBC would be acceptable. 6.2.2 The inflation pressure measured immediately after the test shall not be less than the initial pressure specified in 5.1.1.1.