SAE J1865-2020 PDF

Scope: This SAE Recommended Practice defines a clearance line for establishing dimensional compatibility between drum brakes and wheels with 19.5 inch@ 22.5 inch@ and 24.5 inch diameter rims. Wheels designed for use with drum brakes may not be suitable for disc brake applications. The lines provided establish the maximum envelope for brakes@ including all clearances@ 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.

SAE J1865-2020 history

2020 SAE J1865-2020 Dimensional Compatibility for Commercial Vehicles Fitment of Complete Wheels in Drum Brake Applications - Truck and Bus
2016 SAE J1865-2016 Dimensional Compatibility for Commercial Vehicles Fitment of Complete Wheels in Drum Brake Applications - Truck and Bus
2007 SAE J1865-2007 Dimensional Compatibility for Commercial Vehicles Fitment of Complete Wheels in Drum Brake Applications Truck and Bus
1999 SAE J1865-1999 Dimensional Compatibility for Commercial Vehicles Fitment of Complete Wheels