Diamondback Bicycles 2016 Laurito Hardtail Complete Mountain Bike (27.5-Inch Wheels) Step through 6061-T6 heat-treated aluminum frame has a replaceable derailleur hanger 27.5" wheels roll smoothly on any surface Shimano 7-speed rear derailleurs coupled with 3 chain rings give you 21 speeds Frame eyelets let you mount fenders and a rack