In the late 1960s and early 1970s, Lamborghini's model numbers indicated the number of cylinders and the power class. For example, the R 340 had a 2.2-liter three-cylinder engine with 40 horsepower, the R 365 had 65 horsepower, and the largest, the R 485, had a 5.0-liter engine with 85 horsepower.

The smallest model in the lineup was the R 235, introduced in 1972, which remained in the lineup for almost two decades and kept its model number even though the numbering logic changed shortly after its introduction. The color of the chassis, however, was changed from blue to dark gray in the late 1970s along with the other models.

The R 235 had a 1.8-liter air-cooled diesel engine. The transmission was an unsynchronized 6+2. The tractor was available in both rear-wheel drive and four-wheel drive versions.

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