The stronger compound, the tread design and the durable structure prevent damage to the tread area and the casing. The compound avoids tread damage, such as chipping, cracking and tearing from shortening the service life. The tread eliminates rocks stuck in the footprint, before they can drill into the tread area and harm the casing. This effectively avoids stone retention. The stronger internal structure protects the casing from punctures, cuts and impact damage. This combination greatly enhances the overall service life.