Serfas drifters give you the confidence and freedom to ride almost any environment. Fast rolling inverted tread pattern. Durable construction with reliable flat protection system. Capable dual density tread provides speed and grip across various surfaces. The dual nature of the smart inverted tread design allows the Serfas Drifter decreased rolling resistance, which means a faster and smoother ride on pavement yet plenty of grip for when you decide to go off the beaten path.