WTB Frequency CX i25 Team 32H TCS Rim Unbendium Bulge-a band of material added to the sidewall of the rim to counter torsional, radial and lateral flex 4D drilling provides a perfect interface between the rim and spoke and eliminates the need for eyelets I-Beam: a vertical beam designed to counter spoke loads and provide torsional rigidity On-Ramp feature provides consistent fit between rims and tire for easy installation and inflation WT69 Alloy has superior strength and remains super light