| MODEL | ADLER ISDT 1957 |
| Year | 1957 |
| Engine Type | Twin, two-stroke |
| Displacement / Capacity | 247 cc / 15.07 cu in |
| Bore X Stroke | 54 x 54 mm / 2.1 x 2.1 in |
| Compression Ratio | 6.6:1 |
| Cooling System | Air |
| Max Power | 13.1 kW / 18 hp @ 5590 rpm |
| Max Torque | — |
| Ignition | Battery |
| Induction | Bing carburettor |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | — |
| Clutch | Enclosed |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Twin swinging link |
| Rear Suspension | Plunger with shock absorbers |
| Front Brakes | — |
| Rear Brakes | — |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.25-16 |
| Rear Tyre | 3.25-16 |
| FUEL SYSTEM | |
| Fuel Capacity | 12 Litres / 3.17 US gal |
| Fuel Consumption | — |
| Top Speed | 125 km/h / 77.7 mph |
Sporting version of Adler's 250 twin two-stroke, named for the International Six Days Trial and rated at 18 hp, more than the road models. It has a single seat, spoked 16-inch wheels and a 12-litre tank.
