BS AU 50-4.1.1:1995 pdf free download.Tyres and wheels Part 4: Rim profiles and dimensions Section 1: Car rims Subsection 1.1 Specification for metric series rims.
1 Scope
This part of ISO 4000 specifies the designation, contour and dimensions of 5° tapered (drop-centre) rims primarily intended for passenger cars.
The designation, dimensions and load ratings of tyres (metric series) are given in ISO 4000-1.
2 Normative reference
The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO 4000. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO 4000 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 3911:1977, Wheels/rims — Nomenclature, designation, marking, and units of measurement.
3 Definitions
For the purposes of this part of ISO 4000, the
definitions given in ISO 3911 apply.
4 Designation and marking
The rim shall be designated by its nominal rim diameter code, nominal rim width code and rim flange type (for example, 15 × 6 J or 13 × 5.50 B).
5 5° tapered (drop-centre) rims
5.1 Rim flanges
Recommended rim flanges are given in Table I for the appropriate nominal rim diameter code.
5.2 Rim contours
Dimensions and tolerances of the rims shall be as given in Figure 1 and Table 2. Optional bead seat contours and their dimensions are given in Figure 2.
5.3 Rim diameter and hump circumference The specified rim diameter, D. for the appropriate nominal rim diameter code and the hump circumference are given in Table 3.
5.4 Valve holes
Value hole edges on the tyre side of rims shall be rounded or chamfered; valve hole edges on the weather side of rims shall be free from burrs that could damage the valve stem. Suitable valves shall be used. Valve hole details for snap-in valves shall be as shown in Figure 3 or Figure 4. Holes for other valves are under consideration.