The Serfas 26x1.5 Drifter City Tire Bicycle Tire Drifter gives you the best of both worlds because it is set up to handle the pavement and light duty trails.. The Inverted Tread Design Reduces Rolling Resistance for More Speed. This tire also has the F.P.S. Flat Protection System reduces possibility of flat tires. Keep them on the road or take them on your favorite dirt road.