What are Major Tread Grooves defined as?

Major Tread Grooves are specifically characterized as grooves that are molded through the full thickness of the tread rubber. This means they play a critical role in a tire's performance by enhancing traction, aiding in water dispersion to prevent hydroplaning, and contributing to overall vehicle safety. The design and depth of these grooves are crucial for maintaining effective grip on various road surfaces, especially under adverse weather conditions.

The other options describe features that do not align with the definition of Major Tread Grooves. Shallow indents in tire rubber do not provide the same functional benefits. Wrinkles in the tire surface and decorative patterns also do not contribute to the tire's performance in the same manner and are not considered part of the tread groove system. Thus, understanding that Major Tread Grooves must be molded through the full thickness emphasizes their importance in tire safety and performance.