Hopefully someone can help me out. I just had my tires rotated today and there was some cupping on the front. They told me it wasn't a safety issue but it might not be as smooth of a ride. I haven't noticed any vibrating yet, just loud noise. When I hit 55mph though, I did notice that my back tires (the ones that were on the front that are cupped) started to skate and it freaked me out a bit, not going to lie. Is this normal? Will the skating eventually go away? I leave for a conference in two days and will be taking the interstate and I really don't want it to be an issue. Thanks!