Michelin Wild XC Race Tire - 29 x 2.25 Tubeless Folding BLK Racing Line GUM-X Cross Shield E-BikeMichelin Wild XC Race Tire 29 x 2. 25 Tubeless Folding Black Racing Line GUM X Cross Shield E Bike. The next generation Wild XC Race tire provides more grip on loamy courses. Tread design provides maximum braking and responsive cornering inspired by Wild Enduro ranges Gum X compound optimizes the balance between rolling efficiency and traction Cross Shield 2 casing provides extra pinch protection designed to prevent tread and sidewall damage The tires