This SAE Recommended Practice contains dimensions and their tolerances concerning disc wheel to hub or drum interface areas for truck and bus applications. Disc wheels designed only for single wheel applications (not dual wheels) for light trucks and special or less common applications are not covered in this document.
The primary change was adding provisions for interrupted hub flange surfaces to accommodate some disc brake mounting designs. Reworded scope to apply to truck and bus not commercial vehicles and multipurpose passenger vehicles. “for single applications” changed to “designed only” for “single wheel applications (not dual wheels) for light trucks” in scope. Added section 18.104.22.168, Figure 4, and Table 3. Table 1 and 2 were revised to show options for various different rim widths. “Aluminum disc wheels” removed from footnote 1. Footnote 3 added. Section 2.1 title changed from “Publications” to “Documents”. “SAE” changed to “SAE International”. Section 2.1.1 Title of SAE J1671 was updated. Section 2.2.1 added SAE J2696 reference. Corrected titles to SAE J1842 and SAE J2696, ISO 7575. Reworded Section 3 introduction describing SAE J393 further. Sections 1 and 2 are now titled with very large text to clearly separate them. Section 1 title now includes ISO 7575 reference. Added “nut” reference to title of section 2. Figures 1 and 2: added “Only required on face or faces mounting to hub or drum” to further specify wheel chamfer. Figure 3 further specified alternate fillet within the bounds of a 1.4mm maximum regular fillet. Table 4 corrected title of d4 dimension to “Maximum” was “minimum”. Table 5 mounting system XVII aluminum wheel thickness 20mm was 15.5mm. Table 6 0.38 was 0.36. Figures 6 and 7, chamfers made optional on ball seat wheels, and minimum on flange nut mounting only on surface mounting to wheel or drum. Table 8 added Aluminum to mounting system XVII. Table 9 system VII G 1.47, 1.85 was 1.45, 1.81.