BSA M21 (1937-1961) Specs, Performance & Photos
Maintained by:
Segment: Clasic
Production years: 1937, 1938, 1939, 1940, 1941, 1942, 1943, 1944, 1945, 1946, 1947, 1948, 1949, 1950, 1951, 1952, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1960, 1961
4 Photos
The M21 from British manufacturer BSA sports an air-cooled, four-stroke, 591cc, single cylinder powerplant mated to a four-speed manual transmission that can reach a maximum power output of 15 horsepower at 4200 rpm. Standard fittings for this classic machine include laced wheels, drum brakes in the front and in the rear, a large headlight, a hard-tail rear suspension, a single spring girder fork in the front, a sprung single seat and a chromed exhaust system.
BSA M21 1937-1961
BSA M21 591
| engine specs | Type: | air-cooled, four-stroke, single cylinder, side valve | Displacement: | 591 cm3 | Bore X Stroke: | 3.2x4.4 in OR 81 mm | Compression Ratio: | 5.0:1 | Horsepower: | 15/4200 KW(hp)/RPM | Torque: | 0/- lb-ft/RPM OR 0 Nm/RPM | Fuel System: | Amal carburetor |
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| transmission specs | Gearbox: | 4-speed, manual | Clutch: | dry, multi-plate | Primary Drive: | - | Final Drive: | chain |
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| chassis specs | Frame: | steel | Front Suspension: | single spring girder fork | Rear Suspension: | hard-tail, sprung seat | Front Brake: | drum | Rear Brake: | drum |
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| dimension specs | Overall Length: | 85.8 in OR 2179 mm | Overall Width: | 29.1 in OR 739 mm | Seat Height: | 28.5 in OR 724 mm | Wheelbase: | 54 in OR 1372 mm | Ground Clearance: | 4.6 in OR 117 mm | Weight: | 368 lbs OR 167 kg | Fuel Capacity: | 3.7 gallons OR 14.0 L |
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| tyres specs | Front: | 3.25 x 19 | Rear: | 3.50 x 19 |
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