The Zeta Disc wheelset features new smooth-rolling WCS forged disc hubs The rear hub sits the innovative Ratchet Driver system offers a 360degree, 36-point engagement Tubelessready extruded alloy rims Ritchey’s pioneering OCR™ technology off-center spoke hole drilling allows equal spoke tension throughout the wheel Wheels ship with preinstalled Ritchey rim tape for easy set up With a 20mm inner width, these rims welcome tires between 25 and 45mm wide