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| info | |
| 1929 - 1932, Standard-tread tractor | |
| Series next: | Wallis 20-30 |
| Production | |
| Manufacturer: | Massey-Harris |
| Factory: | Racine, Wisconsin, USA |
| Dimensions & Tires | |
| Wheelbase: | 78 inches [198 cm] |
| Weight: | 3,455 lbs [1567 kg] |
| Front tire: | 28x5 |
| Rear tire: | 44x10 |
| 12-20 Serial Numbers | |
| - Serial numbers unknown - |
| Wallis 12-20 Power | |
| Drawbar (claimed): | 12 hp [8.9 kW] |
| Belt (claimed): | 20 hp [14.9 kW] |
| Plows: | 2 |
| Drawbar (tested): | 18.07 hp [13.5 kW] |
| Belt (tested): | 24.16 hp [18.0 kW] |
| Mechanical | |
| Chassis: | 4x2 2WD |
| Steering: | manual |
| Belt Pulley | |
| Diameter: | 17 inches [43 cm] |
| Width: | 6 inches [15 cm] |
| RPM: | 540 |
| Speed: | 2,400 ft/min [731.52 meters/min] |
| info | |
| Bore/Stroke: | 3.875x5.25 inches [98 x 133 mm] |
| Rated RPM: | 1000 |
| Starter type: | hand-crank |
| Engine Detail | |
| Wallis, gasoline, 4-cylinder, liquid-cooled, 248 ci [4.1 L] |
| info | |
| Series next: | Wallis 20-30 |
| Transmission | |
| Type: | gear |
| Gears: | 3 forward and 1 reverse |
| Clutch: | dry disc |
| info | |
| Series next: | Wallis 20-30 |
| Dimensions | |
| Weight: | 3,455 lbs [1567 kg] |
| Wheelbase: | 78 inches [198 cm] |
| Width: | 55 inches [139 cm] |
| Height: | 51 inches [129 cm] |
| Wallis 12-20 Tires | |
| Ag front: | 28x5 (steel) |
| Ag rear: | 44x10 (steel) |