| MODEL | BSA B29 250 / B29 250 DE LUXE 1929 |
| Year | 1929 |
| Engine Type | Four-stroke, single cylinder, OHV |
| Displacement / Capacity | 249 cc / 15.2 cu in |
| Bore X Stroke | 63 x 68 mm |
| Compression Ratio | — |
| Cooling System | — |
| Max Power | — |
| Max Torque | — |
| Ignition | Magneto |
| Induction | — |
| Start System | Slip-on kick starter |
| TRANSMISSION SPECS | |
| Lubrication | Mechanical hand pump |
| Gear Box | 2-speed |
| Clutch | Dry |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Duplex |
| Front Suspension | Single spring girder fork |
| Rear Suspension | None, spring loaded saddle |
| Front Brakes | 140 mm / 5.5 in drum |
| Rear Brakes | 140 mm / 5.5 in drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | From 711 mm / 28 in, adjustable |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 2.75 x 24 |
| Rear Tyre | 3.00 x 24 |
| FUEL SYSTEM | |
| Fuel Capacity | 5.7 Litres / 1.5 US gal |
| Fuel Consumption | — |
| Top Speed | — |
A late-1920s lightweight 250 cc overhead-valve BSA with a two-speed gearbox, girder forks and an adjustable-height saddle, sold in standard and de Luxe forms. It was a basic, economical machine of the pre-war era.
