SCHWALBE 2.1 2013 Model Racing Ralph Performance Different Thread Folding Tire, 26-Inch PaceStar triple compound is designed for extremely fast XC; Features easy rolling base layer, medium compound center, and medium-soft shoulders LiteSkin construction features light, thin sidewalls for reduced weight and reduced rolling resistance Tubeless Ready design requires tire sealant to complete the process SnakeSkin construction features a light and flexible carcass that makes the tire highly resistant to scrubbing