WTB Trail Boss 2.25 27.5" TCS Tough Fast Roll Tire Tightly spaced, blocky tread minimizes rolling resistance until braking allows the knobs to truly dig in Supportive side knobs deliver traction when trying to keep the bike upright on off-camber surfaces Commonly used as a rear tire with a WTB Vigilante on the front Rear tire of choice for our enduro athletes, while also excelling as a front tire on hardpack trails 870g