Ritchey: Tom Ritchey believes in high quality aluminum road wheels because they offer incredible performance and durability that’s hard to beat at any price.He designed 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 Classic finish version that is sure to add a timeless aesthetic to any build. 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 Competition 2.0/1.8 double butted / silverFront: 24 spokes / 12x283mm / 12x285mm / 2x lacingRear: 24 spokes / 12x283mm / 12x285mm / 2x lacingNipples: 2.0 brass 12mm / silverWeight: 1750g/set Do not use sealants containing ammonia