Stan's No Tubes Raven 29x2.2 Ultra fast rolling tread pattern and dual durometer rubber with taller side knobs and wide tire casing for even better traction in all riding conditions Can be used with tubes or tubeless with Stan s tire sealant Larger side knobs for increased traction when cornering Non-directional tread pattern, not front or rear specific 29 tire features extra strong folding bead design Designed to be used at low pressures 120 TPI 20-40 PSI 525 grams