On those Goodyear F-1s. I had cupping as well. Problem was toe adjustment. I discovered that my two local Chrysler dealers are not able align the wheels without first deflating them to get the spider mounted, then re-inflate the tires for the alignment rack. So, I took the car over to a local Mercedes dealer and they lined her right up, dead on. The reason for this is the wheels are Mercedes wheels. They have a pattern of five holes in the hub (under the cover) that the Mercedes dealer mounts the alignment bells to. Tire noise is diminishing and handling is better. Plus I got a tin of breath mints and a free car wash!