Michelin WildRACE'R Adv TLR Mountain Bike Tires The new Wild Race'R is the latest addition to the Michelin Wild Range Designed for use on hardpack terrain Provides better handling, greater efficiency thanks to a new tread design, and new architecture on the crown Dual Compound Technology combines a hard layer underneath the surface for protection with a surface layer that is softer to maximize grip 68-Shore sub-tread with a 63-Shore surface tread 127 tpi 530 grams