21 Speed Shifting system ensure you to brakes for safety at any speed.,Dual Disc brake provided great stopping power. If you have any questions or problems for tuning the brake or shifting system, please feel free contact us directly for help!,This bicycle arrives with 85% assembled. You need to install the front wheel, pedals, handlebar, seat and air up the tires. We do not supply any bicycle assembly service for online pays or for free.,All packages delivery via "Express", needs the signature when it delivered. If you do not need a signature, please contact us to arrange the shipment without signature before the package shipped.,Bicycle are the oversize products, some of items may be causing scratches/damages causing during the shipping. If you received such items, please contact us directly for assistance, we will do our best to solve the problem for you at soonest!