What provides stability for turning in a tire?

The tread rib is crucial for providing stability during turns. It refers to the continuous bands of tread that run circumferentially around the tire. When a vehicle turns, the tread ribs maintain contact with the road surface, helping to ensure that the tire grips effectively. This grip is essential for maintaining control and stability in the vehicle's handling while negotiating curves.

In contrast, other components like the tread block serve different purposes, such as enhancing traction and providing a channel for water drainage. The bead is the part of the tire that secures it to the wheel rim, and while it plays a role in overall tire performance and safety, it does not specifically contribute to turning stability. The sidewall provides structural integrity and is designed to absorb impacts and help maintain the tire's shape, but it does not directly influence the stability when turning the vehicle. Therefore, the tread rib is the most relevant element when discussing stability during turns.