Continental X-King Bike Tire PRO CHOICE- Developed in conjunction with the Topeak Ergon Pro mountain bike team, ultimately becoming the perfect race day tire. SYMMETRIC TREAD- The tread pattern was designed symmetrically to provide an ample amount of traction while still retaining minimal rolling resistance. BETWEEN RACE AND MOUNTAIN- The X-King fits perfectly for riders looking for something between the Race King and Mountain King. WIRE BEAD- Features the Performance Wire Bead.