BS ISO 12934:2021 pdf download – Tractors and machinery for agriculture and forestry — Basic types — Vocabulary Note 1 to entry: This term is not to be confused with track (see ISO 789-13:2018, 3.3) that measures vertical planes through the centreline of the tyres. 3.2.1 agricultural tractor self-propelled agricultural vehicle (3.1.2) having at least two axles and wheels, endless tracks, or a combination of wheels and endless tracks, particularly designed to pull, push, carry or provide power to operate implements or pull agricultural trailers and implements, or any combination of these functions used for agricultural work (including forestry work), which may be provided with a load platform Note 1 to entry: The agricultural vehicle (3.1.2) has a maximum design ground speed (3.1.4) of not less than 6 km/h and may be equipped with more than one seat. 3.2.1.1 standard agricultural tractor agricultural tractor (3.2.1) having a minimum wheel track width of 1 150 mm or greater, the overall width not exceeding 2,55 m with at least one permissible tyre or endless track combination, an unladen mass, in running order, of 400 kg or greater, and a ground clearance of 1 000 mm or less 3.2.1.2 two-wheel drive tractor agricultural tractor (3.2.1) with traction power provided only through the rear tyres Note 1 to entry: The front tyres are smaller than the rear and typically use a profile type with no traction capability. 3.2.1.3 all-wheel drive tractor agricultural tractor (3.2.1) with two axles or more, having power to all axles Note 1 to entry: The drive of one or more axles may be disengageable. 3.2.1.3.1 four-wheel drive tractor with unequal sized wheels all-wheel drive tractor (3.2.1.3) with primary power provided through the rear tyres and disengageable power through the front tyres Note 1 to entry: The front tyres are generally larger in rolling radius than those of a two-wheel drive tractor and use a tyre profile that will transmit traction capability. 3.2.1.3.2 four-wheel  drive tractor with equal sized wheels all-wheel drive tractor (3.2.1.3) with equal sized wheels and having power to both axles 3.2.1.3.3 all-wheel drive tractor with more than 2 axles all-wheel drive tractor (3.2.1.3) with more than two axles having power to all axles 3.2.1.4 track-laying tractor agricultural tractor (3.2.1) propelled by belted or linked endless tracks or by a combination of wheels and endless tracks Note 1 to entry: Belted units in this definition may have a...

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