10 material differences · fewer than 12
Tractor oneDavid Brown 770 Selematic1965–1970No measured PTO figureTractor twoInternational Harvester B-2751958–1961No measured PTO figure
Which should you choose?
We will not advise between these two machines, because they were not built in overlapping years (1965–1970; 1958–1961). The figures below are side by side so you can judge them yourself; each says whether it was measured, claimed or declared by its source.
Field by field
10 material differences · 5 fields identical or within 5%, which is not counted as material
| Field | 770 Selematic | B-275 | Gap |
|---|---|---|---|
| Engine | |||
| Engine power, claimed claimed | 33.0 hp | 34.5 hp | — |
| Engine declared | DAVID BROWN AD 3/49 A (B) | INTERNATIONAL HARVESTER BD-144 | differs |
| Displacement declared | 2.39 L | 2.36 L | — |
| Maximum torque declared | 101 lb·ft · 137 N·m | 95 lb·ft · 129 N·m | +6% 770 Selematic |
| Transmission | |||
| Top speed declared | 15.5 mph · 25 km/h | 13.7 mph · 22 km/h | +14% 770 Selematic |
| Clutch declared | Pedal-operated dry Borg & Beck single-plate clutch | Pedal operated two stage dry Borg and Beck double clutch | differs |
| Hydraulics & hitch | |||
| Pump flow declared | 5.4 gpm · 20.4 L/min | 6.0 gpm · 22.7 L/min | +11% B-275 |
| Rear PTO speeds declared | 540 rpm | 540 rpm | — |
| Weight & dimensions | |||
| Unladen weight declared | 3,228 lb · 1,464 kg | 3,459 lb · 1,569 kg | +7% B-275 |
| Wheelbase declared | 75.0 in · 1,905 mm | 74.1 in · 1,883 mm | — |
| Length declared | 112.5 in · 2,858 mm | 122.4 in · 3,110 mm | +9% B-275 |
| Width declared | 64.6 in · 1,641 mm | 65.7 in · 1,670 mm | — |
| Ground clearance declared | 16.5 in · 419 mm | 15.6 in · 397 mm | +6% 770 Selematic |
| Turning radius, braked declared | 10.1 ft · 3.07 m | 9.5 ft · 2.90 m | +6% 770 Selematic |
| Fuel tank declared | 38.5 qt · 36.4 L | 42.0 qt · 39.7 L | +9% B-275 |
Height is not in this table. It is not one measurement: the sources measure it to different points — over the cab on some machines, over the steering wheel or the exhaust on others — and the same tractor measured two ways can differ by most of a metre. It appears here only when both machines' figures carry the point they were measured to and it is the same point, which is not the case for these two. Each machine's own page prints its height as its source gives it.
David Brown 770 Selematic sources
- Source: Traktorenlexikon, “David Brown 770”
International Harvester B-275 sources
- Source: Traktorenlexikon, “IHC B-275”
- Source: Traktorenlexikon, “McCormick B-250”
- Source: Traktorenlexikon, “McCormick B-275”