Which type of tire tread features rounded shoulders with lugs placed perpendicular to the center line?

The type of tire tread that features rounded shoulders with lugs placed perpendicular to the centerline is recognized as cross-country tread. This design is specifically tailored for smooth performance on a variety of surfaces, particularly in off-road conditions but not exclusively for extreme terrains like mud or heavy trails. The rounded shoulders help the tire to maintain stability and provide effective handling, improving traction while still allowing for good speed and reduced rolling resistance when navigating across grassy or moderately rugged terrain.

In contrast, other tread types are designed with different features to address specific needs. All-terrain treads usually have more aggressive lugs and stronger shoulders for versatile performance across various terrains, while mud terrain treads often possess large, deep lugs and a more open pattern to effectively clear mud and soft soil, maximizing grip in difficult conditions. Slick treads, on the other hand, lack significant tread patterns making them suitable primarily for dry pavement rather than off-road use. Understanding the unique characteristics and intended applications of each tire tread design clarifies why cross-country tread is identified by its distinct design features.