Specialized fast trak armadillo tire black 29 x 2.1Punctures suck, which is why weve incorporated our legendary Armadillo flat resistant technology into the Fast Trak Armadillo tire. Not only that, but we also took the tread design of the Fast Trak a step further by manipulating each knob with Finite Element Analysis. Paired with extensive rider feedback and design experience, the result is an XC tire with less rolling resistance and more traction, all with Armadillo puncture protection from bead to