Bührer GM-29 SUPER-SIX (A)
Built: 1968–1975 · Series: G („Super“)
More machines from model year 1968
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Bührer GM-29 SUPER-SIX: six-cylinder flagship of the G range, 73.5 kW (100 hp), 255 Nm torque, 2,810 kg unladen weight, built 1968 to 1975
Bührer, a Swiss tractor maker based in Hinwil in the canton of Zurich, ran the G range as a Super line alongside simpler Standard ranges such as O-Standard or M/N Standard, competing with brands such as Hürlimann and Meili. The model name SUPER-SIX names both the trim and the engine layout: the six-cylinder. The GM-29 SUPER-SIX (A) was built from 1968 to 1975.
Read on 3 more paragraphs
The engine is a water-cooled six-cylinder diesel of 5,672 cm³ displacement, producing 73.5 kW (100 hp) at 2,000 rpm and developing 255 Nm of torque. With an unladen weight of 2,810 kg, a length of 4,000 mm, a width of 1,890 mm, a height of 1,700 mm and a wheelbase of 2,500 mm, it reaches a top speed of 22 km/h.
At 22 km/h the GM-29 SUPER-SIX falls within driving licence category L up to 40 km/h. As the flagship of the G range, the six-cylinder of around 5.7 litres displacement formed the top end of Bührer's programme in those years, built for heavy tillage and draft work on larger Swiss farms rather than light yard duties.
When buying such a flagship six-cylinder second-hand, the operating hours and the condition of the injection pump, the tightness of the engine and cooling system, and wear on the clutch and gearbox matter. Rust on the cab and sheet-metal parts, together with a traceable maintenance history, give further insight into how hard this rare model has been worked, and parts usually mean searching among collectors.
Sources: SpecCodex-Register: Kennwerte des Modells Bührer GM-29 SUPER-SIX (A)
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 100 hp (73.5 kW)correct |
| Rated speed | 2,000 rpmcorrect |
| Torque | 255 Nmcorrect |
| Speed at max. torque | 1,600 rpmcorrect |
| Cylinders | 6correct |
| Displacement | 5,672 cm³correct |
| Bore | 97 mmcorrect |
| Stroke | 128 mmcorrect |
| Compression ratio | 17correct |
| Injection pressure | 177 barcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 4,000 mmcorrect |
|---|---|
| Width | 1,890 mmcorrect |
| Height | 1,700 mmcorrect |
| Wheelbase | 2,500 mmcorrect |
| Ground clearance | 420 mmcorrect |
| Unladen weight | 2,810 kgcorrect |
Drivetrain and chassis
| Drive | rear- or four-wheel drivecorrect |
|---|---|
| Gearbox | 15 V/3 Rcorrect |
| Forward gears | 15correct |
| Reverse gears | 3correct |
| Front tyres | 7.50-16 ASF (A: 10.5-18 AS)correct |
| Rear tyres | 16.9-30 AS (A: 18.4-30 AS)correct |
| Top speed | 22 km/hcorrect |
Origin and approval
| Construction | combined frame and unit constructioncorrect |
|---|---|
| Units built | 51 (A: 14)correct |
Other data
| Linkage category | Cat IIcorrect |
|---|
Where this model stands
Power-to-weight ratio: 26.2 kW/t (74 kW / 2.8 t)
Power class: Universal (40–100 hp)
Stronger than 66% of the tractors in the register — out of 15,663 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Bührer GM-29 SUPER-SIX (A) have?
The Bührer GM-29 SUPER-SIX (A) delivers 100 hp.
How much does the Bührer GM-29 SUPER-SIX (A) weigh?
The unladen weight is 2,810 kg.
What engine does the Bührer GM-29 SUPER-SIX (A) have?
6 cylinders, 5,672 cm³ displacement, Diesel.
How fast does the Bührer GM-29 SUPER-SIX (A) go?
Top speed is 22 km/h.
What are the dimensions of the Bührer GM-29 SUPER-SIX (A)?
4,000 mm × 1,890 mm × 1,700 mm.
When was the Bührer GM-29 SUPER-SIX (A) built?
Production years: 1968–1975.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 30 individual figures for this model. They come from 2 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Sources: Wikibooks Traktorenlexikon (CC BY-SA 4.0) (retrieved August 2026) · How we check the data
Tractor in 3D section
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