WTB Nano 2.1 29" TCS Light Fast Roll Tire XC / Trail / Dry to Damp / Pavement to Sand Blends minimal rolling resitance with consistent traction. The tire of choice for endurance racing and touring. TCS tubeless for proven reliability and supple traction. 685g Usage: Cross-Country / Trail Conditions: Dry to Damp / Pavement to Sand WTB's TCS tubeless technology Casing: Lightweight Weight: 685 grams