| 摘要 |
PROBLEM TO BE SOLVED: To provide an estimation method of a block breakage due to a sipe of a tire. ! SOLUTION: This endurance test method includes: a deterioration step of deteriorating a tire whose tread surface is formed with a sipe; a travelling step of causing the tire subjected to this deterioration step to travel; and an observation step of observing the generation of a crack of the sipe of the tire subjected to the travelling step. In this deterioration step, the tire is exposed to the atmosphere of 70°C or more and 100°C or less for the period of two days or more and 14 days less. In this travelling step, the air is filled with normal inner pressure, and a predetermined load of 0.6 times or more and 0.8 times less of the standard maximum load F is added to the tire, and a predetermined slip angle of 1° or more and less 4° is imparted to the tire, and the tire is made to travel at a speed of 50 km/h or more and less 70 km/h. In this observation step, whether or not a crack occurs in the sipe is |
