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BS ISO 7867-1:2018 - TC Tracked Changes. Metric series for agricultural, forestry machines and construction tyres - Tyre designation, dimensions and marking, and tyre/rim coordination, 2020
- 30357690_New.pdf [Go to Page]
- National foreword
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions [Go to Page]
- 3.1 Tractor drive wheel tyres
- 4 Tyre size designation [Go to Page]
- 4.1 General
- 4.2 Tyre type prefixes
- 4.3 Nominal section width
- 4.4 Nominal aspect ratio
- 4.5 Tyre construction code
- 4.6 Nominal rim diameter code
- 4.7 Tyre type suffixes
- 5 Marking [Go to Page]
- 5.1 General
- 5.2 Tyre size designation
- 5.3 Service description
- 5.4 Additional information
- 5.5 Tyre classification and nomenclature
- 5.6 Tyre maximum pressure for bead seating pictogram
- 6 Tyre dimensions [Go to Page]
- 6.1 General
- 6.2 Calculation of "design tyre" dimensions [Go to Page]
- 6.2.1 General
- 6.2.2 Theoretical rim width, Rth
- 6.2.3 Measuring rim width, Rm
- 6.2.4 Design tyre section width, S
- 6.2.5 Design tyre section height, H
- 6.2.6 Design tyre overall diameter, DO
- 6.3 Calculation of "minimum overall tyre dimensions" [Go to Page]
- 6.3.1 Minimum overall width, Wmin
- 6.3.2 Minimum overall diameter, DO,min
- 6.4 Calculations of "maximum overall tyre dimensions in service" [Go to Page]
- 6.4.1 General
- 6.4.2 Maximum overall width in service, Wmax
- 6.4.3 Maximum overall diameter in service, DO,max
- 6.5 Coefficients for calculation of tyre dimensions
- 7 Tyre dimensional data
- 8 Method of measurement of tyre dimensions
- 9 Tyre and rim coordination [Go to Page]
- 9.1 Approved rim widths
- 9.2 Approved rim contours
- 10 Tyre parameters for vehicle speed reference
- Annex A (normative) Tyre design dimensions and approved rim width codes
- Annex B (normative) Dimensional guidelines for rim widths and nominal rim diameters
- Annex C (informative) Approved rim contours for metric agricultural tractor drive wheel and implements tyres on 5° and 15° tapered rims
- Annex D (informative) Rolling circumference (RC), rolling circumference index (RCI) and speed radius index (SRI) values for metric drive wheel tyres
- Bibliography [Go to Page]