Ritchey: Tom Ritchey believes in high-quality aluminum road wheels—they offer incredible performance and durability that’s hard to beat at any price. He redesigned the critically acclaimed Zeta to be wider, lighter and laterally stiffer—perfect for a great road riding experience, yet still tough enough to endure gravel road rides and cyclocross races that would chew lesser wheels to pieces. Combining decades of historic ride-proven research and testing with modern standards, the Zeta Disc is now available in a tubeless-ready Comp-level version, offering the legendary Ritchey ride quality at a more attainable price. Each Zeta wheelset is hand-built by a qualified wheel technician. OCR® rims design (Off Center Rim) reduces wheel dish to balance spoke tension for a stronger, stiffer wheel. Rims: alloy Tubeless Ready - OCR 3mm offsetRim depth: 23.4mmOuter rim width: 24.4 mmInner rim width: 19.5mmSuggested tire size range: 25mm-40mmHubs: forged disc hubs and sealed bearings Freewheel: patented 6-pawl, 12-point micro-clutch engagement systemFreehub material: alloyFreehub options: Shimano / Sram XD-RoadCompatibility: Shimano 9/10/11-speed and 12-speed road cassette - Sram XD/XDR (freehub conversion kits available separately)Disc brake compatibility: 6-boltsAxle style: thru-axle 100x12mm front / 142x12mm rearAxle compatibility: thru-axle (12mm) - standard quick release (conversion kits available separately)Spokes: DT Champion 2.0 straight / blackFront: 24 spokes / 12x283mm / 12x285mm / 2x lacingRear: 24 spokes / 12x283mm / 12x285mm / 2x lacingNipples: 2.0 brass 12mm / blackWeight: 1750g/set Do not use sealants containing ammonia