BSA B21250

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Bsa-b21-03.JPG
BSA B21250
Manufacturer
BSA
Production 1937 - 39
Engine
Four stroke, single cylinder, Overhead valve
Ignition Magneto
Battery 6V
Transmission 4-Speed, hand change
Frame Triangulated cradle type
Suspension Front: Girder, spring loaded fork
Rear: None, spring loaded saddle
Wheelbase 1575 mm / 62 in.
Weight
Oil Capacity 2.3 L / 4.8 US pints
Fuel Capacity 13.6 L / 3.6 US gal
Manuals Service Manual



Chassis[edit | edit source]

The front suspension was a Girder, spring loaded fork while the rear was equipped with a None, spring loaded saddle. The B21250 was fitted with a 13.6 L / 3.6 US gal fuel tank. The wheelbase was 1575 mm / 62 in. long.

Photos[edit | edit source]

BSA B21250 BSA B21250 BSA B21250

Overview[edit | edit source]

BSA B21





In the 1930s Birmingham's BSA was the world's most productive manufacturer, with a stretch of models between 150cc and 1000cc, produced in single cylinder and/or vee twin configurations. They enjoyed a particular strength in the quarter litre class, with a variety of side- and overhead valve models, offered in standard or de-luxe spec, one of the latter's options being foot-change gearbox operation.

Due to a disastrous attempt at the TT, back in the early 1920s, BSA deliberately avoided any forms of competition for the greater part of the Thirties, in complete contrast to their post war philosophy. Even so, in a contemporary magazine road test impression the B21 in question was reported to have 'peppy' performance and, "...contrary to its sturdy appearance was found surprisingly easy to manoeuvre on to the rear stand".


Make Model BSA B21
Year 1937 - 39
Engine Type Four stroke, single cylinder, Overhead valve
Displacement 249 cc / 15.2 cub in
Carburetor Amal
Oil Capacity 2.3 L / 4.8 US pints
Exhaust Single, chrome silencer
Ignition Magneto
Battery 6V
Starting Kick starter
Transmission 4-Speed, hand change
Final Drive Chain
Gear Ratios 1st 18.2 / 2nd 12.4 / 3rd 8.1 / 4th 6.2
Frame Triangulated cradle type
Front Suspension Girder, spring loaded fork
Rear Suspension None, spring loaded saddle
Wheelbase 1575 mm / 62 in.
Ground Clearance 124 mm . 4.9 in.
Fuel Capacity 13.6 L / 3.6 US gal
Colour Green or blue tank, black frame
Source Bonhams

External Links[edit | edit source]