Radial runout in a set of tires will cause the exact symptom that you are describing. Goodyear calls it lane wondering. If the tires are not directional try then in opposite corners. 875kCSTQ X-Goodyear Employee -- Michael Ryan Cell: (613) 541-8585 Ryan Computer Services Fax: (613) 634-3567 Kingston, Ontario Email: mryan@adan.kingston.net Canada K7M 6L9