The purgatory was a great performing tyre but with fe analysis specialized have made it even better slightly altered knob designs result in a faster grippier tyre to tackle any all mountain riding excursion specialized purgatory control features casing 420d1 for 15 improved cut resistance bead foldable butyl wrapped bead 2bliss ready center compound 60a shoulder compound 50a 26 x 23 psi 35 65 approx weight 685g 29 x 23 psi 35 65 approx weight 755g