Ritchey: Some of Tom's favorite experiences have been while pedaling his tandem all over the world with his wife Martha. When he designed the new Outback TandM Break-Away, he wanted a wheelset that could withstand the rigors of riding tandems along varying surfaces. The result is the new Comp Zeta TandM wheelset.The Comp Zeta TandM wheels build upon all the advantages of the original Comp Zeta Disc wheels but include some tandem-friendly features. The quick release disc hubs measure 100mm wide for the front and 145 in the back and are laced with beefier spokes and brass nipples to 36-hole Zeta tubeless-ready rims. Designed specifically for the Ritchey Outback TandM Break-Away frameset, the unique Comp Zeta TandM wheelset is strong, reliable and integrates beautifully with the frameset for many miles of happy tandeming. 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 offset Rim depth: 23.4mmOuter rim width: 24.4 mmInner rim width: 19.5mmSuggested tire size range: 25mm-40mmHubs: forged disc hubs and sealed bearingsFreehub material: steelFreehub options: ShimanoCompatibility: Shimano 9/10/11-speed and 12-speed road cassetteDisc brake compatibility: 6-boltsAxle style: standard quick release only 100mm front / 145mm rear (Ritchey forged quick releases included) Spokes: DT Champion 2.0 straight / blackFront: 36 spokes / 18x283mm / 18x285mm / 3x lacingRear: 36 spokes / 18x283mm / 18x285mm / 3x lacingNipples: 2.0 brass 12mm / blackWeight: 2077g/set (959g - front / 1118g - rear)