| Attribute | Velocette Mac 1956 × | Aermacchi Chimera 250 1962 × |
|---|---|---|
| General | ||
| Production from (year) | 1956 | 1962 |
| Make | Velocette | Aermacchi |
| Model | Velocette Mac | Aermacchi Chimera 250 |
| Category | Allround | Sport |
| Engine and transmission | ||
| Engine type | Twin, four-stroke | Single cylinder, four-stroke |
| Fuel system | Carburettor | Carburettor. DellÓrto |
| Displacement (cm³) | 349 | 246 |
| Power (kw) | 13.1 | 10 |
| Cooling system | Air | Air |
| Transmission type,final drive | Chain | Chain |
| Bore (mm) | 68 | 66 |
| Stroke (mm) | 96 | 72 |
| Gearbox | 4-speed | - |
| Fuel control | Overhead Valves (OHV) | - |
| Ignition | - | Bobine |
| Compression | - | 7.0:1 |
| Chassis | ||
| Front suspension | - | Telescopic |
| Front brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) | Expanding brake (drum brake) |
| Diameter (mm) | 152 | 140 |
| Front tyre | 3.25-19 | 2.50-17 |
| Rear tyre | 3.50-19 | 2.50-17 |
| Seat | - | Dual |
| Wheels | - | Spoked |
| Other | ||
| Starter | - | Kick |
| Dimensions | ||
| Wheelbase (mm) | 1,276 | 1,360 |
| Dry weight (kg) | 161 | 125 |
| Power/weight ratio | 0.0814 | 0.08 |
| Performance | ||
| Top speed (km/h) | - | 120 |