Maxxis Aspen ST Tire - 29 x 2.25, Tubeless, Folding, Black, MaxxSpeed, EXOThe Aspen ST is an ultra low profile race tire designed primarily for short track XC use. Sometimes referred to as the "Fastpen," this tire is sure to give any racer an edge in dry conditions. MaxxSpeed features a high silica content compound that reduces rolling resistance while also enhancing wet traction EXO casing provides protection on sidewalls for extreme cut and abrasion resistance while remaining lightweight and highly flexible Aspen ST tires