The profile compound and carcass make this the perfect racing tyre in the third generation of the schwalbe racing ralph evo pace star liteskin 26 mountain bike tyre is designed for speed this light tubeless ready version uses the pacestar triple star compound this is designed to go fast and still give you plenty for grip the centre thread is made from a medium density rubber while the shoulder is made from a medium soft rubber to help the knob move and give you more grip in the corners