Trek X-Caliber 9 bicycle, size S, 27.5" wheels, in excellent condition, barely used, with many upgrades from the stock build. The following components have been added: Fox 32 SC Performance air fork, Ascend dropper post, Spank stem, Centerline brake rotors, Shimano XT 1x11 drivetrain (derailleur, chainring, cassette, and cranks). Platform pedals. Very light and fast-rolling, everything recently serviced.