BMW R57back 1930

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Air cooled, 494cc, Boxer, OHV

Power: 17.95 HP (13.2 kW) @ 4000 rpm
Final drive: Shaft
Top speed: 71.46 mph
Curb weight: 330.7 lbs
Category: Classic
Tags: All-rounder, Classic bike
Engine and transmission
Engine type: 2 cylinders, 4-stroke, Boxer
Displacement: 494 cc (30.18 cubic inches)
Bore × stroke: 2.68 inch × 2.68 inch (square)
Cooling system: Air cooled
Power: 17.95 HP (13.2 kW) @ 4000 rpm
Throttle: Cable operated
Valves
Valve train: OHV, variable
Valves per cylinder: 2
Fuel and ignition
Sparks per cylinder: 1
Fuel supply system: Carburetor
Funnel diameter: 0.94 inch
Compression: 5.8:1
Engine mounting: Longitudinal
Lubrication system: Wet sump
Gear box: Manual 3-speed
Clutch: Dry, single plate, cable operated
Final drive: Shaft
Spark plug pipe type: Bosch, W 175
Starter: Kick-starter
Dimensions
Physical measures
Length: 82.7 inch
Width: 31.5 inch
Height: 37.4 inch
Wheel base: 55.1 inch
Weight
Curb weight: 330.7 lbs
Chassis and suspension
Frame type: steel, Double cradle frame
Front
Suspension: Leading link
Brake: Single Drum, Ø7.87 inch
Tire: 3.5 × 26
Rear
Tire: 3.5 × 26
Other
ABS available: No
Power-to-weight ratio: 0.09 KW/lbs (11.36 lbs/HP)
Top speed: 71.46 mph
Fuel capacity: 3.3 gals
Number of riders: 1 person

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