BS AU 50-4.3.1:1991 download.Tyres and wheels Part 4: Rim profiles and dimensions — Section 3: Off-the-road rims — Subsection 3.1 Specification for narrow and wide base off-the-road vehicle rims.
o Introduction
ISO 4250 provides technical details on the designation and dimensions of off-road tyres and rims, as well as load ratings for these types of tyres. This International Standard consists of three parts:
— Part 1: Tyre designations and dimensions;
— Part 2: Loads and inflation pressures;
— Part 8: Rims.
1 Scope
This part of ISO 4250 sets out the designation, contour and dimensions for rims for narrow and wide base off-road tyres.
2 Field of application
This part of ISO 4250 applies to rims primarily
intended for off-road machines.
3 Rim identification
3.1 Codes shall be used to identify:
a) specified rim diameter, D (see Table 7); b) nominal width between flanges:
c) nominal flange height or rim profile designations.
3.2 The rim markings shall consist of codes for:
a) specified rim diameter, I)
b) nominal width between flanges: the markings shall be on the weather side of the rim, and visible when the tyre is mounted.
3.3 Where a disc is fitted by the rim/wheel manufacturer, the marking shall appear on either the disc or rim base.
3.4 Loose flanges shall be marked on an externally visible surface. The marking shall indicate nominal height and nominal diameter.
4 Rim contours
Rim contours are given in Figure 1 to Figure 4 and Table 1 to Table 4.
5 Rim knurling
Rim knurling details are given in Figure 5, and Table 5 and Table 6.
6 Rim loads and inflations
The load and inflation pressure imposed on the rim and wheel shall not exceed the rim and wheel manufacturer’s recommendations, even though the tyre may be approved for a higher load or inflation. Consult the rim and wheel manufacturer to determine if rim and wheel capacities are adequate for the intended service.
7 Rim dimensions
Rim dimensions are standardized for size and contour only, and for particular tyre and rim combinations designated to ensure proper mounting and fit of the tyre to the rim.
8 Bibliography
Iso 391 1,Wheels/rims — Nomenclature, designation, marking and units of measurement.