The tread design, with the optimal groove pattern, features smaller rock-ejecting knobs on the groove bottoms which prevent stones from lodging into the tread area. These knobs help eliminate rocks stuck between the tread elements before they can drill into the casing and harm the tire. The result is the tire's prevention of stone retention. The stronger compound and the stronger steel belt structure protect the tire from punctures, cuts and impact damage, which may shorten the tire's service life. This results in a safer year round performance.