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Schwalbe Thunder Burt Tire - 27.5 x 2.1 Tubeless Folding BLK Evolution Super Ground Addix Speed Product Type_Chain Lock }Shimano Ultegra R8000 Chainring -Schwalbe Thunder Burt Tire 27. 5 x 2. 1 Tubeless Folding Black Evolution Super Ground Addix Speed. 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. PaceStar: fast rolling cross country compound with easy rolling base layer fast center and grippy shoulders TECH SPECS