Nano race this is the 1 tyre choice for tour divide the longest mountain bike race in the world stretching from canada to mexico along the rockies it features an elevated centerline that rolls effortlessly on hard surfaces numerous micro knob working edges providing lateral traction and predictability and a voluminous casing designed to go the distance it39s no wonder why the nano is a favorite tire of ultra endurance mega athlete jay petervary dna rubber compound wtb39s proprietar