Affordable Gravel disc wheels, a great upgrade for heavy stock OEM wheels 21mm wide 6061 alloy clincher rim, ideal for wider tires Sealed cartridge bearing front and rear hubs, Center Lock rotor interface 4 pawls engaging simultaneously on 36 teeth (10 degrees of engagement) Swappable hub end caps for any axle configuration Pillar TB2018 round double butted spokes with brass nipples HG 11sp road: Compatible with HG splined Shimano/SRAM 11sp cassettes. Also compatible with Shimano/SRAM 810sp cassettes with spacer XDR is 1.85mm longer than XD Driver, occupies the same space as an 11speed HyperGlide road driver Optional 15x100, QRx100, and QRx135 hub end caps sold separately Swappable XDR, Microspline, and Hyperglide freehub bodies sold separately Made in USA