Constructed for maximum durability and endurance, CCT Technology: “Chipping and Chunking Tread” prevents chipping and breaking out of tread blocks, CCRC Technology: “Chipping & Chunking Resistant Compound”, significantly minimizes rubber loss due to abrasion, considerably reduces the tendency of lug tearing in extremely hard terrain. Notes: EN1 Enduro GP: ECE + DOT homologated + FIM approved, Character: Approved tires for Enduro competitions (Enduro sport) EN1 Extreme / The Tough One NHS: Not for Highway use! Only suitable for racing. Character: Hard Enduro tires (Extreme) Type Article Construction diagonal Width 90 Mounting front Application Cross, Enduro, Racetrack Speed index M Size 90/90-21 Main color black Tread EN1 Enduro EN1 Extreme EN1 The Tough One Cross-section 90 Tube designation TT = tube type Load index 54 Inch 21 "