Subsystems Transmission Type Single speed fixed gear Overall Final Drive Ratio Small motor: 9.325:1 Large motor: 9.734:1 Reverse Gear Reverse direction of motor, limited to 15 mph (24 km/h) Steering Type Rack and pinion with electronic power steering, speed sensitive Number of turns lock to lock 2.05 Turning Circle (curb to curb) 40.8 ft (12.4 m) Brakes 4-wheel anti-lock braking system (ABS) with Electronic Brake Force Distribution, Type Integrated Advanced Stability Control and Electronic Accelerator pedal actuated regenerative braking system Calipers Front: Four piston, fixed Rear: Single piston, floating Rotor Diameters (ventilated) Front: 13.98”/355 mm Rear: 14.37”/365 mm Front Rotor thickness New: 1.26”/32 mm Service limit: 1.18”/30 mm Rear Rotor thickness New: 1.10”/28 mm Service limit: 1.02”/26 mm Front Brake Pad Thickness (excluding back plate) 0.346”/8.8 mm Rear Brake Pad Thickness (excluding back plate) 0.354”/9 mm Parking brake Electrically actuated parking brake calipers 204 Model X Owner's Manual