Maxxis Ardent Mountain Tire 27.5 x 2.25 Dual Compound Tubeless-ready EXO BlackMaxxis Ardent tires. An aggressive tread in high volume casing, designed with great traction in mind. The Ardent doesn't forget the racer with large block style side knobs offering numerous edges for high speed cornering. The center tread, while ideal for braking and accelerating traction, also features ramped knobs to minimize rolling resistance. Large block style side knobs offer numerous edges for high speed cornering Ramped knobs on center tread