Ritchey: The do-everything aluminum race wheel is wider, lighter and stiffer than ever—and now available in a tubeless disc brake version.Tom Ritchey believes in high quality aluminum road wheels—they offer incredible performance and durability that's hard to beat at any price. The critically acclaimed Zeta is completely redesigned to be wider, lighter and laterally stiffer, yet still tough enough to endure gravel road rides and cyclocross races that would chew lesser wheels to pieces. New dedicated disc brake version features new two-piece forged hubs and disc-only OCR rim extrusion.The Zeta Disc wheels feature new forged two-piece WCS disc hubs, and the disc-specific, tubeless Zeta OCR™ rims are light, stiff and wide. Forged, machined and staggered hub flange increases spoke bracing angle and builds a stronger, lighter wheel.Each Ritchey wheelset is hand-built by a qualified Ritchey wheel technicianRear hub easily serviceable without tools, including cassette body removal Rims: alloy Tubeless - OCR offset - proprietary Ritchey extrusion Rim depth: 24.4mmOuter rim width: 25.5 mmInner rim width: 21.0mmSuggested tire size range: 25mm-45mmHubs: 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 - Campy 10/11/12-speed (freehub conversion kits available separately)Disc brake compatibility: Centerlock (hub center-lock lockrings available separately)Axle style: thru-axle 100x12mm front / 142x12mm rearAxle compatibility: thru-axle (12-15mm) - standard quick release (conversion kits available separately)Spokes: DT Competition 2.0/1.8 double butted / blackFront: 24 spokes / 12x287mm / 12x288mm / 2x lacingRear: 24 spokes / 12x287mm / 12x288mm / 2x lacingNipples: 2.0 brass 12mm / blackWeight: 1650g/set Do not use sealants containing ammoniaEasily serviceable