Brand new never mounted handbuilt Mavic XM419 rear wheel, 650B/27.5", centerlock rotor mount, 142x12mm axle, Formula sealed bearing hub, Shimano/SRAM 11 speed freehub (will fit road or mtb cassette), 28 hole, DT Competition spokes. I got this wheel for a 650B gravel bike but have decided to go a different direction. I also have a new DT Swiss 650b/27.5" front wheel for sale in my other ad.