Mongoose Tyax Expert Adult Mountain Bike, 27.5-Inch Wheels, Tectonic T2 Aluminum Frame, Rigid Hardtail, Hydraulic Disc Brakes, Women's Small Frame, Yellow/Teal, Model Number: M29200F10SM-PC. A rider who's newer to the sport, but still demands high performance from their equipment. Internal cable routing allows for neat, clean lines while providing added protection. 29" and 27. 5" wheel and tire options for a wide range of terrain and riding styles