The specialized purgatory grid 2bliss 650b tyre has been designed for exceptional all mountain performance setting the standards high for an entry level tyre specialized have optimised the tread in the purgatory by applying fe analysis so you have a grippier tyre for any all mountain excursion these 650b tyres have a 420d1 casing for 15 improved cut resistance and they have a butyl wrapped bead which means they are 2bliss ready they weigh in at approximately 7625g and they39re are