BSA M21
| Production Year: | 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 |  |
| Type: | air-cooled, four-stroke, single cylinder, side valve |
| 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 |
| Fuel System | Amal carburetor |
| transmission specs | |
| Gearbox | 4-speed, manual |
| Clutch | dry, multi-plate |
| Final Drive | chain |
| chassis specs | |
| Frame | steel |
| Front Suspension | single spring girder fork |
| Rear Suspension | hard-tail, sprung seat |
| Front Brake | drum |
| Rear Brake | drum |
| 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 |
| Ground Clearance | 4.6 in OR 117 mm |
| Weight | 368 lbs OR 167 kg |
| Fuel Capacity | 3.7 gallons OR 14.0 L |
| Wheelbase | 54 in OR 1372 mm |
| tyres specs | |
| Front | 3.25 x 19 |
| Rear | 3.50 x 19 |
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