Wtb nano race cyclo cross tyrethis is the 1 tire 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 it is no wonder why the nano is ultra endurance mega athlete jay petervarys favorite tire race designed to be run wit