Tire Threads

Tire threads are not just pure decoration.
A proper tread design improves traction, improves handling and increases durability. They also have a direct effect on ride comfort, noise level and fuel efficiency that cannot be underestimated. Each thread element has a different name, and a different function and effect on the tire.

Sipes. Small, slit-like grooves in the tread blocks that allow the blocks to flex. This added flexibility increases traction by creating an additional biting edge. Sipes are especially helpful on ice, light snow and loose dirt.

Grooves. Create voids for better water channeling on wet road surfaces. Grooves are the most efficient way of channeling water from in front of the tyres to behind it. By designing grooves circumferentially, water has less distance to be channeled.

Blocks are the segments that make up the majority of a tyre’s tread. Their primary function is to provide traction.

Ribs. Straight-lined row of blocks that create a circumferential contact “band.”

Dimples. Indentations in the tread, normally towards the outer edge of the tyre. They improve cooling.
Shoulders provide continuous contact with the road while maneuvering. The shoulders wrap slightly over the inner and outer sidewall of a tire.

Void Ratio. The amount of open space in the tread. A low void ratio means a tyre has more rubber is in contact with the road. A high void ratio increases the ability to drain water. Sports, dry-weather and high performance tires have a low void ratio for grip and traction. Wet-weather and snow tires have high void ratios.