this may be a dumb question but i'm not a tire guy. anyone know if a directional tire is on backwards if it will cause a vibration? I just bought some used 17x10 cobra wheels with tires for the back of my car a little while ago and have been dealing with some vibration issues. I noticed that the 2 i bought the tires are on the same way so one is on backwards. just wondering if this could be adding to my issues as i have herd several things about this down to the only problem is the traction and water shed of the tire.