Fast rolling street style tread built tough for cargo use with heavy loads. Large rectangular knobs down the middle section paired with textured shoulder knobs offer good traction and durable long lasting tread life. SDEF – Super Defense extremely strong double carcass gives the tire excellent safety under heavy loads and increased extra puncture protection. AE – Addix E compound is an E-bike specific compound that ensures exceptionally good durability riding performance and grip with ECE-R75 certification