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The detailed comparison between Ducati Street Fighter S and BMW F650GS can help you decide which one of them will suit you better. Your choice of motorcycle should be all about your individual preferences and comfort level. A good way to narrow the circle of favourite bikes is to compare their technical specifications and select just a few that are really matching your style and needs. The best way to explore them is to actually sit on these bikes and check how much comfort you get with each of them.

Ducati-Street Fighter S   vs   BMW-F650GS
Picture of Ducati - Street Fighter S
Ducati manufacturer BMW
Street Fighter S bike name F650GS
Sport bike mootorcycle type Adventure
2009-2012 year 2010
212 / 77 / 112 cm overall size L/W/H(cm)228 / 89 / 124 cm
1099 cc engine displacement (cc)798 cc
Marelli electronic fuel injection fuel supply method electronic intake pipe injection, 45mm throttle bodies
12.5:1 compression ratio 12:1
104x64.7 mm bore and stroke 82x75.8 mm
150mm (5.9 inches) ground clearance 260mm (10.2 inches)
2.8litres (3 quarts) engine oil capacity2.9litres (3.1 quarts)
17.0 litres (4.5 gallons) fuel tank capacity 16.0 litres (4.2 gallons)
248 km/h (154 mph) top speed192 km/h (119 mph)
155 hppeak horsepower 71 hp
115 nm (84.8 ft lbs)max torque 75 nm (55.3 ft lbs)
167 kg (368 lbs) dry weight171 kg (377 lbs)
197 kg (434 lbs) curb weight (wet weight) 198 kg (437 lbs)
43mm Ohlins inverted forks with adjustable spring preload, compression and rebound damping front suspension 43mm Marzocchi upside down forks. 180mm wheel travel.
single Ohlins shock with 127mm wheel travel rear suspension cast aluminum dual swing arm, central spring strut, spring preload, hydraulically adjustable. The rear wheel travel is 170mm.
120/70-ZR17 front tyre size 110/80-R19
190/55-ZR17 rear tyre size 140/80-R17
6-speed multiple-plate clutch transmission type 6-speed
Electric starting ignition / starting Electric
dual 330mm discs with 4-piston Brembo monoblock radial calipers front brakes dual discs with 300mm diameter and double piston floating caliper
single 245mm disc with 2-piston Brembo caliperrear brakes single 265mm disc with single piston floating caliper
Chain drivefinal drive typeChain drive
Liquid coolingcooling typeLiquid cooling
5.30 l/100km (44.4 mpg)fuel economy (consumption)5.20 l/100km (45.2 mpg)
technical specifications of Ducati Street Fighter Ssee data separatelytechnical specifications of BMW F650GS

The bigger engine size of Ducati Street Fighter S in comparison to BMW F650GS doesn't mean that it is more powerful or better performing bike. We can see that the compression ratio of the first of this bikes is 12.5:1 and is the bigger one. This is the ration of the volumes in the cylinder in two stages of the stroke when the piston is at the lowest and then at the highest point in the cylinder. When the mixture of air and fuel in the combustion chamber has bigger pressure (higher compression ratio) when it is ignited then it burns more effectively and therefore these bikes tend to have better fuel economy (comparing engines with equal displacement).
The better fuel economy of 5.20 l/100km belongs to BMW F650GS compared to the Ducati Street Fighter S's fuel consumption of 5.30 l/100km. When measured in mpg the fuel economy shows how many miles can be traveled with a gallon of fuel. Alternatively when measure in l\100km it shows the fuel consumption in litters per 100 kilometer trip.
bike tiresIf the time to replace your motorcycle tyres has come then you need to find the proper new ones. Another considerable factor here is your own riding style. To choose the right tire size firstly you need to understand the meaning of the numbers printed on the size of the tire. The width of the tire measured in millimeters is shown first. The aspect ratio of the tire is represented by the second number of the code. The third of the code numbers reffers to the size of the rim and it is measured in inches. Since many internet stores are offering motorcycle tires it is an easy way to get proper pair of tires online at reasonable price.
BMW F650GS has bigger ground clearance than Ducati Street Fighter S (260mm vs 150mm). The ground clearance is also called the ride height and that is the distance between the base of the tyre and underside of the motorcycle’s body (the chassis). To say it shortly, this is the smallest of the measures between the road surface and any mechanical part of the motorcycle.
Ducati Street Fighter S appears to be faster than BMW F650GS with top speed of 248km/h against 192km/h for the other bike. Sometimes of course motorcycle speed statistics may be contradictory from various sources.Liquid cooled engine of a motorcycleThe same method of engine cooling is used on both motorcycles - liquid cooling. Liquid-cooled engines have a narrower range of operating temperatures compared to the air-cooled ones. Therefore liquid cooled motors can run with carburetion set to burn all the fuel in the mixture. The circulation of the coolant from the radiator to the engine is helped by the water pump. The temperature is kept at a relatively constant level by a thermostat which turns on a fan to draw more air over the radiator if needed. However the water pump, the thermostat, the radiator and all the linking gear makes it a bit more complex.
final drive implemented with chain Chain final drive is used with both motorcycles - the Ducati Street Fighter S and the BMW F650GS. Chain drives are by far the most popular final drive technology in the history of motorcycles and are the most economical way to drive power from the engine to the rear wheel. However chains have their down points - more frequent need of maintenance (lubrication and cleaning) which means that a biker should always keep an eye on the chain especially in rainy days or dusty roads.
Compression ratio Imagine an engine's piston is at the bottom of its stroke (step one) and moves up compressing the gas in the cylinder till it reaches its top position of the stroke (step 2). The compression ratio is the ration of the volume in step one over the volume in step two. The value of the compression ratio of BMW F650GS is 12:1 based on the information in its technical data and for Ducati Street Fighter S the ratio is 12.5:1. Motorcycles with higher compression ratio may be recommended to use premium fuel only in order to avoid engine knocking. If you got a motorcycle with a greater compression ratio for its specific engine it is getting better fuel economy than it would if it had a lesser compression ratio.
To keep the engine in good health it is important to observe the good qulity and proper level of the motor oil. Engine oils are different types as synthetic, mineral, part-synthetic and they all come at their price and qualities. The engine oil is to be changed on every 3700 miles (or 6000 kilometers) as a general rule. More kilometers between two oil changes is accepted when synthetic oil is used. The oil filter needs to be replaced too and that is usually to be done with the oil change. Both motorcycles have different oil capacity according to the technical specs - 2.8 litres for Ducati Street Fighter S and 2.9 litres for BMW F650GS. The oil capacity information is only to get an idea of how much oil roughly will be needed on oilchange. Observing the currrent level on the dipstick or the level sight window is the best way to pour the proper amount of oil.

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