REAR SHOCK HAS BEEN DISABLED ON THIS BIKE The Bafang Mid-Drive motor and Shimano Nexus Inter-8 internal gear hub do not have a derailleur to absorb rear shock chain stress. A working rear shock cannot be used on this bike. See pictures. Bike is fully functional and high performance. Features: 48V 14AH Samsung SinLion Battery Bafang M600 Mid-Drive Brushless Motor 48V 500W Shimano Nexus Inter8 C6001-8D Internal 8 Speed Geared Hub Front and rear Tektro hydraulic disk brakes Bafang DPC 241 Display with 5 Speed assist controller. Bike speeds up to 25mph. Battery life 20 - 40 miles. 2 Amp battery charger included. Tires: Mountain Bike Style Kenda K1153-014 29x2.10 Wheel Outside Diameter 25.5" - Tire Outside Diameter 29" All aluminum 6061 alloy frame. Weight 65lbs. Bike is new in box, minimal assembly required.