Rubbered In

Rubbered In refers to the condition of a racetrack after it has accumulated layers of tire rubber from cars driving over it, especially along the racing line, resulting in increased grip and faster lap times.

When cars race around a track, tiny bits of rubber from their tires wear off and stick to the asphalt surface. This process, called "rubbering in," transforms a slippery "green" track into a high-grip racing surface. The deposited rubber essentially creates a stickier path that allows cars to corner faster and accelerate more effectively.

Track conditions constantly evolve throughout a race weekend as more rubber accumulates. However, rain or extended periods without racing can wash away this rubber layer, requiring the rubbering in process to start again. Drivers must adapt their racing lines and techniques based on how rubbered in a track is.