BSA B21 de Luxe
| Production Year: | 1937, 1938, 1939 |  |
| Type: | air-cooled, four-stroke, single cylinder, OHV |
| engine specs | |
| Type | air-cooled, four-stroke, single cylinder, OHV |
| Displacement | 249 cm3 |
| Bore X Stroke | 2.5x3.1 in OR 64 mm |
| Horsepower | 5/3000 KW(hp)/RPM |
| Fuel System | Amal side float carburetor |
| transmission specs | |
| Gearbox | 4-speed, manual |
| Clutch | dry |
| Final Drive | chain |
| chassis specs | |
| Frame | steel |
| Front Suspension | single spring girder fork |
| Rear Suspension | hard-tail, sprung seat |
| Front Brake | none |
| Rear Brake | hand lever and foot pedal working independently on rear wheel dummy rim |
| dimension specs | |
| Weelbase | 62 in OR 1575 mm |
| Ground Clearance | 4.9 in OR 124 mm |
| Fuel Capacity | 3.6 gallons OR 13.6 L |
| Wheelbase | 62 in OR 1575 mm |
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