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 technician Rear hub easily serviceable without tools, including cassette body removal SPECIFICATIONS Rims: alloy Tubeless - OCR offset - proprietary Ritchey extrusion Rim diameter: 700c Rim depth: 24.4mm Outer rim width: 25.5 mm Inner rim width: 21.0mm Suggested tire size range: 25mm-45mm Hubs: forged disc thru-axle hubs and sealed bearings Hub spacing: 100x12mm front / 142x12mm rear Axle compatibility: thru-axle (12-15mm) - standard quick release (conversion kits available separately) Freewheel: patented 6-pawl, 12-point micro-clutch engagement system Freehub material: alloy Freehub options: Shimano / Sram XD-Road Compatibility: 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) Spokes: DT Competition 2.0/1.8 double butted / black Front: 24 spokes / 12x287mm / 12x288mm / 2x lacing Rear: 24 spokes / 12x287mm / 12x288mm / 2x lacing Nipples: 2.0 brass 12mm / black Weight: 1650g/set Color: black Do not use sealants containing ammonia