2009 BMW F SpecsModel: 800 ST; 800 GS; 650 GSEngine Type: 798cc, liquid-cooled, parallel-twin 4 stroke (all models)Bore and Stroke:3.23 inches x 2.96 inches (800 ST and 800 GS); 3.23 inches x 3 inches (650 GS)Compression ratio: 12.0:1 (all designs)Valve Train: DOHCInduction: Fuel injectedIgnition: ElectricTransmission: Six-speed manualFinal Drive: Belt (800 ST); chain (800 GS and 650 GS)Fuel Capacity: 4.1 gallons (800 ST); 4.2 gallons (800 GS and 650 GS)Estimated Fuel Economy: 54.2 miles per gallon (800 ST)Brakes (Front): Dual hydraulic disc (800 ST); hydraulic disc (800 GS and 650 GS)Brakes (Rear): Hydraulic discSuspension (Front): Telescopic fork (800 ST and 650 GS); inverted fork (800 GS)Suspension (Rear): Twin-sided swing arm with adjustable preload and rebound damping (all models)Wheelbase: 57.7 inches (800 ST); 62.1 inches (800 GS); 62 inches (650 GS)Rake: N/ATrail: N/ASeat Height: 33.1 inches (800ST); 34.6 inches (800 GS); 32.2 inches (650 GS)Curb Weight: 461 pounds (800 ST); 455 pounds (800 GS); 439 pounds (650 GS)Tires (Front): 120/70 ZR17 (800 ST); 90/90 R21 (800 GS); 110/80 R19 (650 GS)Tires (Rear): 180/55 ZR17 (800 ST); 150/70 R17 (800 GS); 140/80 R17 (650 GS).