Model Z8 Z8 Pro MOTOR Rear Gear Hub Motor 750W(Peak 1500W, Torque 80Nm) BATTERY Single Battery Support - 48V 15.6Ah 31.2Ah Dual Battery (2 x 48V 15.6Ah) MAX SPEED 28 MPH EBIKE CLASS Multi-class 1-3 with Speed Limit Setting CHARGER 48V 2A*1 48V 2A*2 BRAKE SYSTEM Front & Rear Mechanical Disc Brake RANGE (ELECTRIC/ASSISTED) 40/75 Miles 80/150 Miles SUSPENSION Front Fork & Rear Double Spring Suspensions DISPLAY Backlit LCD Display WEIGHT (W. BATTERY) 81 (94) lbs 81 (107) lbs MAX LOAD 300 lbs CLIMBING ANGLE 35° CHARGING TIME 6-8H FRAME Carbon Steel SENSOR 12-Magnet Cadence TIRE 20''*4 All-Terrain Fat Tire FRONT FORK Aluminum Hydraulic Suspension Fork DERAILLEUR Shimano 7-Speed FREEWHEEL/CASSETTE 7-Flywheel Cassette CRANKSET 42T/170MM CONTROLLER 48V Frame-integrated Controller LIGHTS Front & Rear LED Light FENDERS Front and Rear Full Coverage PEDAL ASSIST 5 Levels PAS THROTTLE Half-twist WATER-RESISTANT IP54 SAFETY UL 2272 Compliant RIDER HEIGHT 5'3” to 6'1”