Bicycle rim. As light as carbon fiber, yet wider than competing aluminum rims, WTB shows what's possible with the new WT69 aluminum. Built with one goal in mind—winning. Dual I-Beam for structural strength. Technologies: TCS 2.0 – The TCS rim profile was designed specifically for TCS or UST tires, but can also be successfully used with tube systems. This profile increases the stiffness of the entire structure. When mounting tubeless tires (TCS or UST) using a TCS rim, significantly less initial pressure is required to inflate the tire. In most cases, a standard hand pump can handle the job. An additional tape groove prevents tearing of the sealing tape. 4D – A new drilling process used in Stryker wheels and Frequency rims ensures a perfect fit between the spokes and the rim. Drilling the holes at an angle reduces spoke stress and increases spoke strength.