Schwalbe Thunder Burt Tires.The development goal of this tire was to combine the best of the Racing Ralph and Furious Fred. With its many small lugs, it has the grip of the Racing Ralph but the low rolling resistance of the Furious Fred. FEATURES: PaceStar: fast-rolling cross country compound with easy-rolling base layer, fast center and grippy shoulders Super Ground construction SPECS: Labeled Size: 29 x 2.10 Color: Black ISO Width (mm): 53 Flat Protection: Sidewall ISO Diameter: 622 / Road / 29" Tire Intended Use: Mountain Tire Type: Tubeless Ready Clincher Tire Bead: Folding Tire Diameter: 29"