Continental Xynotal Tire - 29 x 2.40 Tubeless Folding BLK Endurance Trail Casing E25Continental Xynotal Tire 29 x 2. 40 Tubeless Folding Black Endurance Trail Casing E25. The Xynotal tire provides control over hardpack rocky surfaces. With low rolling resistance and contact edges for improved traction and braking you can enjoy a fast gravity ride with the confidence of continuous grip when you need it most. Carcass construction is robust and impervious against damage and penetration from foreign objects resulting in a versatile low