|Also called||M 21|
|Production||1937 - 1956|
|Class||[[:Category:Classic motorcycles|Classic]] [[Category:Classic motorcycles]]|
single cylinder, four-stroke
|Bore / Stroke||82.0mm x 112.0mm|
|Horsepower||14.62 HP (10.9 KW) @ 4000RPM|
|Transmission||Gear box: 4-speed, manual
Final Drive: chain
|Suspension||Front: hydraulic telescopic
Rear: twin shock
|Brakes||Front: expanding brake (drum brake)
Rear: expanding brake (drum brake)
|Wheelbase||54.02 inches (1372 mm)|
|Length||85.79 inches (2179 mm)|
|Width||29.09 inches (739 mm)|
|Seat Height||28.5 inches (724 mm)|
|Weight||396.83 pounds (180.0 Kg) (dry), 167.0 kg (wet)|
|Fuel Capacity||3.0 Gallon (11.36 Liters)|
The bike has a 4-speed, manual transmission. Power was moderated via the wet multiplate.
It came with a 3.25-19 front tire and a 3.25-19 rear tire. Stopping was achieved via expanding brake (drum brake) in the front and a expanding brake (drum brake) in the rear. The front suspension was a hydraulic telescopic while the rear was equipped with a twin shock. The M21 was fitted with a 3.0 Gallon (11.36 Liters) fuel tank. The bike weighed just 396.83 pounds (180.0 Kg). The wheelbase was 54.02 inches (1372 mm) long.
1937 - 1961 BSA M21
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.