<p><span style="font-family:Verdana,Geneva,sans-serif">This article describes the development of methods for calculating the wear resistance of tapered roller bearings of trucks, and presents findings from the research work implemented in order to determine the wear resistance of friction pairs operating in the presence and absence of abrasive particles in the oil of the main transmission in a motor vehicle, friction pairs inner ring – roller and outer ring - roller bearings operating in rolling with slippage and pure rolling.</span></p>