BSA M21
Make Model
Year
Engine
Capacity
Bore x Stroke
Up to 1938: 85 x 105 mm
After 1938: 82 x 112 mm
Induction
Ignition
Max Power
Transmission
Gear Ratios
Solo: 1st 14.3 / 2nd 9.9 / 3rd 6.3 / 4th 4.8:1
Sidecar model: 1st 16.6 / 2nd 11.5 / 3rd 7.3 / 4th 5.6:1
Front Suspension
Up to 1947: Girder
After 1947: Telefork
Rear Suspension
Up to 1947: None, spring loaded saddle
After 1947: Plunger type
Front Brakes
Up to 1955: Drum, 7 in
After 1956: Drum, 8 in
Rear Brakes
Front Tyre
Rear Tyre
Dimensions
Length: 2180 mm / 85.8 m
Width: 740 mm / 29.1 in
Wheelbase
Ground Clearance
Saddle Height
Dry Weight
Fuel Capacity