A small hardtail that is perfect for a young rider getting in to the sport. It's got good quality components, but since it isn't full suspension, it won't break the bank. We bought it new and my son used it for two years but has now outgrown it. His height ranged from about 4'8" to 5' when he used it. 27.5 (650B) Bontrager Mustang Elite wheels, Shimano Deore XT rear derailleur, SRAM X7 front derailleur, Shimano hydraulic disk brakes, RockShox Recon front fork. 2x10 drivetrain. All the components are the ones that came stock with the bike.
(http://archive.trekbikes.com/us/en/2016/Trek/x_caliber_9#/us/en/2016/Trek/x_caliber_9/details)