Warranty reviews have shown that two of the larger failure modes for wheel bearings are contaminant ingress and Brinell damage from curb and pothole impacts. As material cleanliness and tribology are better understood, the industry is seeing less failures from rotating fatigue in wheel bearings. Warranty has also shown that larger wheels have higher rates of Brinell warranty. This paper discusses a vehicle test that helps General Motors evaluate Brinell performance for wheel bearings. The paper also reviews a design of experiments that measures factors such as wheel size, vehicle loading and vehicle position versus impact load. As the trend in vehicle styling is moving to larger wheels and lower profile tires, understanding the load from impacts helps properly size wheel bearings.