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Dimensional Compatibility for Commercial Vehicles Fitment of Complete Wheels in Drum Brake Applications—Truck and Bus
- Ground Vehicle Standard
- J1865_200707
- Revised
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This SAE Recommended Practice defines a clearance line for establishing dimensional compatibility between drum brakes and wheels with 19.5 in, 22.5 in, and 24.5 in diameter rims. Wheels designed for use with drum brakes may not be suitable for disc brake applications. The clearance line establishes the maximum envelope for brakes and minimum envelope for complete wheels to allow for interchangeability.
This document addresses the dimensional characteristics only, and makes no reference to the performance, operational dynamic deflections, or heat dissipation of the system. Valve clearances have not been included in the fitment lines. Bent valves may be required to clear brake drums. Disc brake applications may require additional running clearances beyond those provided by the minimum contour lines. Mounting systems as noted are referenced in SAE J694.
Rationale
This SAE Recommended Practice currently defines clearance lines for establishing dimensional compatibility between drum brakes and 19.5, 22.5 and 24.5 in diameter wheels. The modification is to address the fact that not all current wheels used in drum brake applications may be suitable with disc brakes. Work is ongoing with other SAE committees to modify the clearance line to include disc brakes with the eventual objective of including disc brake wheel fitment into this document.
Recommended Content
Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| TABLE 1 | CLEARANCE LINES |
Issuing Committee
The responsibility of the Truck and Bus Wheel Committee of the Truck and Bus Brake and Advanced Driver Assistance Systems Steering Committee is to initiate, develop, review and approve the recommended practices, standards, and information reports related to hubs, wheels and the wheel mounting systems of buses, trucks and tractor-trailer combinations intended for highway use. The Wheel Committee is constituted so as to be aware of other SAE wheel activity and to prevent duplication of effort.
Reference
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