The MXX 24 comes standard with a new and improved hub design, the "44" hub A Beefier hub with bigger internals, featuring 108 points of engagement, help you generate more torque and transfer of power for out of saddle efforts Upgraded to a 44mm ratchet rings and offer compatibility with Shimano HG, SRAM XD/XDR, Shimano Micro Spline and Campy Ekar 13 speed The "44" hub has been updated to include a slipfit system to easily swap out end caps to accommodate, 15mm,12mm or QR axles, helping you "future-proof" your wheelset PBO spokes offer up free suspension with a design that deflects harsh hits in the terrain smoothing out the ride by staying true and straight throughout The MXX 24 also features a new 24mm internal carbon rim width to accommodate wider tire compatibility The 26mm profile rim with PBO spokes maintain a lightweight wheelset that can be set up as tubeless Developed for racers and riders alike looking for a superior advantage over other standard wheel designs Rear wheels with the HG 11sp road FH body require the 1.8mm spacer (included) for use with Shimano/SRAM 811sp HG mountain cassettes Rear wheels with the XDR driver require the 1.8mm spacer (included) for use with XD cassettes Spinergy designed Hadley aluminum freehub body Rim dimensions: 26mm deep 24mm internal Included: rim tape and truing tool