Someca BISOMTRAC
Built: 1964 · Series: SOM-Reihe
More machines from model year 1964
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
Someca SOM: the first own-design tractors from Saint-Ouen, from the BISOMTRAC to the SOM-40 B, 14.7 to 45.6 kW, two- and four-cylinder engines with water cooling
Someca (Société de Mécanique de la Seine) was founded in 1953 as an offshoot of carmaker Simca, which took over the farm machinery division of the firm MAP. Someca's first tractor, the DA 50, was still closely based on MAP's DR3 model; the SOM series covers the independent designs that followed, up to the switch to Fiat technology in 1965.
Read on 4 more paragraphs
The register lists 26 live models, from the BISOMTRAC through the SOM-25 to the SOM-40 B, built between 1957 and 1965. Output ranges from 14.7 to 45.6 kW, weight from 930 to 4,500 kg, displacement from 1,135 to 4,397 cm3 across two- and four-cylinder engines.
The series' commercial high point was the SOM 40, launched in 1957: it became one of the most widely built French tractors of its era and helped give Someca a strong market position, before Fiat, as majority shareholder, took over model development with the Series 15 from 1965.
Anyone looking at a SOM-series tractor is looking at Someca's last purely French design generation before full Fiat-licensed production.
Alongside the predominantly diesel engines, the register also lists petrol engines on individual SOM models, not unusual in post-war France when diesel fuel was not reliably available everywhere. On a petrol model, servicing differs fundamentally from the diesel versions: a carburettor and ignition system instead of an injection pump and glow-plug system, which steers the parts search in a different direction when buying used.
Sources: SpecCodex register, model data: Someca SOM-Reihe
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 2 hpcorrect |
| Rated speed | 1,600 rpmcorrect |
| Bore | 105 mmcorrect |
| Stroke | 120 mmcorrect |
| Compression ratio | 15.5correct |
| Injection pressure | 172 barcorrect |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Length | 6,500 mmcorrect |
|---|---|
| Width | 1,745 mmcorrect |
| Height | 1,829 mmcorrect |
| Wheelbase | 3,600 mmcorrect |
| Ground clearance | 364 mmcorrect |
| Unladen weight | 4,500 kgcorrect |
Drivetrain and chassis
| Drive | four-wheel drivecorrect |
|---|---|
| Gearbox | 7 V/2 Rcorrect |
| Forward gears | 7correct |
| Reverse gears | 2correct |
| Front tyres | 14-28 AScorrect |
| Rear tyres | 14-28 AScorrect |
| Top speed | 22 km/hcorrect |
Working data
| Fuel tank capacity | 56 lcorrect |
|---|
Origin and approval
| Construction | frame constructioncorrect |
|---|
Other data
| Linkage category | Cat IIcorrect |
|---|
Where this model stands
Power-to-weight ratio: 0.3 kW/t (1 kW / 4.5 t)
Power class: Compact (< 40 hp)
Stronger than 0% 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 does the Someca BISOMTRAC weigh?
The unladen weight is 4,500 kg.
How fast does the Someca BISOMTRAC go?
Top speed is 22 km/h.
What are the dimensions of the Someca BISOMTRAC?
6,500 mm × 1,745 mm × 1,829 mm.
When was the Someca BISOMTRAC built?
Production years: 1964.
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.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
Request a quote →
We ask the suppliers and come back with price and lead time.
Request spare parts →
This page carries 24 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
Missing a figure you were looking for? Report it →
Know this machine better? Have a photo, a manual, or know that a figure is wrong? Add it to the register →
Other models in this series
SOM-25 D/E
SOM-271
SOM-272
SOM-30
SOM-30 B
SOM-312
SOM-35
SOM-35 DS/DE
SOM-35 GD
SOM-40
SOM-40 B
SOM-40 H
Sources: [1]
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.