Stan's NoTubes The Raven UST 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 Designed to be used at low pressures 120 TPI 20-45 PSI 410 grams