BSA Bantam
D1 Bantam in Mist Green | |
| Manufacturer | BSA |
|---|---|
| Production | 1948–1971 |
| Engine | single-cylinder two-stroke: 123 cc (D1) 148 cc (D3) 173 cc (D5 onwards) |
| Bore / stroke | 52 mm / 57 mm / 61.5 mm × 58 mm (2.05 in / 2.24 in / 2.42 in × 2.28 in) |
| Power | 4.5 bhp (3.4 kW) (D1) 5.3 bhp (4.0 kW) (D3) 7.4 bhp (5.5 kW) (D5 and D7) 10 bhp (7.5 kW) (D10) 12.6 bhp (9.4 kW) (D14/4 and D175 / B175) |
| Transmission | Three speed gearbox (D1 to D10) Four speed gearbox (D10 to B175) |
| Weight | 375 pounds (170 kg) (dry) |
| Fuel capacity | 1.75 imp gal (8.0 L; 2.10 US gal) (D1 and D3) 2 imp gal (9.1 L; 2.4 US gal) (D5 and D7) 1.9 imp gal (8.6 L; 2.3 US gal) (D7 Deluxe onwards) |
| Fuel consumption | 100–125 mpg |
The BSA Bantam is a two-stroke unit construction motorcycle that was produced by the Birmingham Small Arms Company (BSA) from 1948 (as a 123 cc) until 1971 (as a 173 cc). Exact production figures are unknown, but it was between 350,000 and 500,000.