Panaracer fire xc asb tyrethe fire xc is an excellent xc performance tire its distinct tread pattern allows it to perform on a range of terrain and conditions featuress when you see the asb logo it means that the tire has a proprietary anti rebound rubber strip that reduces the chance of pinch flats by an average of 40 panaracers exclusive multi step knobs have various heights designed into each knob these stepped knobs help tires to perform in all conditions from hard to soft short big