| MODEL | BSA B250 DE LUXE 1927 |
| Year | 1927 |
| Engine Type | Four stroke, single cylinder, side valve |
| Displacement / Capacity | 249 cc / 15.2 cu in |
| Bore X Stroke | 63 x 80 mm |
| Compression Ratio | — |
| Cooling System | — |
| Max Power | 1.83 kW / 2.49 hp |
| Max Torque | — |
| Ignition | Magneto |
| Induction | — |
| Start System | Slip-on kick starter |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 2-Speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Single spring girder fork |
| Rear Suspension | None, spring loaded saddle |
| Front Brakes | None |
| Rear Brakes | Hand lever and foot pedal working independently on rear wheel dummy rim |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 711 mm / 28 in (lowest setting, adjustable upwards) |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 2.25 x 24 |
| Rear Tyre | 2.25 x 24 |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | — |
The De Luxe was the more fully equipped variant of BSA's 250 cc side-valve B model. Mechanically it matched the basic machine, with the same two-speed gearbox and chain drive, but with extra fittings suited to buyers wanting a smarter everyday bike.
