| MODEL | BSA 2.49 HP DE LUXE 249 1928 |
| Year | 1928 |
| Engine Type | Single-cylinder four-stroke side-valve |
| Displacement / Capacity | 249 cc |
| Bore X Stroke | 63 mm x 80 mm |
| Compression Ratio | — |
| Cooling System | — |
| Max Power | — |
| Max Torque | — |
| Ignition | Gear-driven magneto in oil-tight case |
| Induction | Amac carburettor |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | Gravity feed to mechanical pump, sight feed on timing case, hand pump |
| Gear Box | BSA three-speed, constant mesh, enclosed kick-starter |
| Clutch | Floating dry-plate in chain wheel, left-hand lever |
| Final Drive | 1/2 in pitch roller chain, cam-faced cush drive |
| CHASSIS SPECS | |
| Frame | Weldless steel tube, forged lugs, pressed-steel chainstays |
| Front Suspension | BSA spring fork with barrel spring and shock absorbers |
| Rear Suspension | — |
| Front Brakes | Internal expanding, 5.5 in, hand lever |
| Rear Brakes | Internal expanding, 5.5 in, toe pedal |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 19 x 2.25 in rims, Dunlop cord wired-on |
| Rear Tyre | 19 x 2.25 in rims, Dunlop cord wired-on |
| FUEL SYSTEM | |
| Fuel Capacity | 1.5 Imperial gal (oil 2.25 pints) |
| Fuel Consumption | — |
| Top Speed | — |
The 249 cc De Luxe was one of the most popular BSAs of the late 1920s, prized for cheap running, easy handling and a low seat. The three-speed gearbox and internal brakes made it a practical solo and pillion machine.
