Diamondback Overdrive 29 Hardtail Mountain Bike, Black General sizing: S=5'4"-5'7", M=5'7"-5'10", L=5'10"-6'1", XL=6'1"-6'4". If you have questions about sizing, feel free to contact us for more information. Complete bikes will be partially disassembled and sealed in a factory box for shipping. Bikes arrive approximately 85% assembled and will require installation of parts and adjustment of components. If you are not comfortable with bicycle assembly or adjustments, we recommend bringing the the bike to a capable bike shop to be built.