Maxxis ASPEN ST MaxxSpeed EXO 120 tpi Tubeless Ready MTB Tire - 29 x 2.25" The 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. It features: Size: 29 x 2.25" Lightweight XC race tire Tubeless Ready Features a high volume casing, ultra low profile center tread EXO: additional densely woven, lightweight, flexible fabric added to casing for enhanced puncture protection MaxxSpeed Silica: Silica filler in the rubber polymer for reduced rolling resistance and better traction in the wet 120tpi casing Folding Bead Weight: 670g.