ISO 4251-1:2019 pdf free.Code designated diagonal tyres (ply rating marked series) for agricultural
tractors, trailers and machines -Tyre designation and dimensions, and approved rim contours.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 4223-1:2017, Definitions of some terms used in the tyre industry — Part 1: Pneumatic tyres
ISO 18804, Runs for agricultural,forestry and construction machines
ISO 18805, Tyre classification — Agricultural,forestry and construction machines
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 42 23-1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.isoorg/obp — IEC Electropedia: available at httn4/www.electronpilii nrgl 3.1 tractor drive wheel tyre tyre designed to be fitted to driven axles of agricultural tractors (vehicles in categories T) suitable for sustained high torque service Note ito entry: The tread pattern of the tyre consists of tugs or cleats. 3.2 tractor steering wheel tyre tyre designed to be fitted to non-driven axles of agricultural tractors (motor vehicles in category T) Note 1 to entry: The tread pattern of the tyre generally consists of circumferential grooves and ribs. 3.3 implement tyre tyre designed primarily for agricultural machines, interchangeable towed equipment (vehicles in category S) or agricultural trailers (vehicles in category R) Note 1 to entry: Such tyre may also equip either front steering wheels and drive wheels of agricultural tractors (vehicles in category T), but it is not suitable for sustained high torque service. 4 Marking 4.1 General The marking of code designated tyres in diagonal construction consists of the tyre size designation, the load rating, and any additional information. See 4.2 to 4.5 for details. 4.2 Tyre size designation The size marking for the identification of tyres consists of: 4.2.1 For normal section height tyres: the nominal tyre width code, the construction code (“-“) and the nominal rim diameter code. EXAMPLES 13.6- 28 6.50- 16 4.2.2 For low section height tyres: either the letter L is added to the nominal tyre width code EXAMPLE 1 9.5L- 15 or the nominal tyre width code is used, followed by “/” and the nominal aspect ratio, the construction code (“) and the nominal rim diameter code EXAMPLE 2 9.5/85- 15 4.3 Categories of use 4.3.1 Agricultural tractor drive wheel tyres The classification code R-2, as specified in ISO 18805, shall be marked on the tyre sidewall to identify tyres with deep tread. 4.3.2 Agricultural tractor steering wheel tyres The classification code F, as specified in ISO 18805, shall be marked on the tyre sidewall. It may, optionally, be replaced by the inscription “FRONT”. The suffix “SL” may be marked after the nominal rim diameter code on the tyre. 4.3.3 Agricultural implement tyres The inscription “IMPLEMENT” or the suffix “IMP” shall be marked on the tyre sidewall. The suffix “SL” may be marked after the nominal rim diameter code on the tyre. EXAMPLES 4.00-12 IMP 4.00-12 IMPLEMENT 4.00-12SL IMPLEMENT The classification code I-3, as specified in ISO 18805, shall be marked on the tyre sidewall in case of “Traction pattern” tyres. ISO 4251-1 pdf download.