The XR1 is an ultra-fast rolling, tubeless-ready cross country race tire ideally suited for dry & dusty conditions. The XR1 Team Issue mountain bike tire features a specifically-tailored compound, with tightly spaced central knobs & an open outer tread design for plenty of high-speed traction plus powerful grip on dusty surfaces. Key Features Ramp center knobs for fast rolling Fast-rolling & predictable cornering Sipes for increased traction on hard pack Excels in hardpack & loamy conditions TLR tire is engineered for use with our own TLR sealant for worry-free setup & puncture protection Inner Strength casing is lightweight sidewall protection thats supple & strong