What is the effect of increasing speed on tyre grip?

Increasing speed can significantly affect tyre grip, particularly under varying road conditions. At higher speeds, the forces acting on the tyre change, which can lead to a reduction in the contact patch—the area of the tyre that touches the road—and hence, the overall grip.

In wet conditions, the situation is exacerbated due to water on the road surface. As speed increases, the chances of hydroplaning also increase, meaning the tyre can lose contact with the road and ride on top of the water, drastically reducing grip. This explains why maintaining control and appropriate speeds in adverse weather conditions is paramount for safety; hence the statement about grip decreasing is particularly relevant in these scenarios.

When conditions are dry and the tyres are in good condition, grip may indeed increase up to a certain point due to better tyre deformation and grip mechanics. However, it is crucial to recognize that the effects of speed on grip are complex and are heavily influenced by external factors like road conditions, the type of vehicle, and tyre condition, making the assertion that speed always increases grip inaccurate.