Manufacturer’s warranty: 6 months for parts & 1 year for frame. Each bike is partially assembled and packed in the original sealed box. 90% of the major parts such as frame, fork, crank, gears, and rear wheel have been pre-assembled. On the other hand, you just need to install the handle bar, pedals, seat, and front wheel. The adjustments of gears, fenders, wheels, brakes may be required. If you are not familiar with bicycle assembly and adjustment, the professional assembly service is recommended. However, the related cost of assembly and adjustments is not covered by the warranty. The average cost of assembly is between $10 and $30. All bicycles will be delivered by FedEx with signature require.