I ordered the Gold Wing Centramatic Stainless Steel Wheel Balancers. I made a mistake and ordered the trike and not but bike kit. I called and they said just send the order back and that they would send me the bike kit and credit my wrong order. Wingstuff did what they promised. The Centramatic Balancers work like a charm. They really smooth out the vibrations going down the road on the bike. Seems to make it really easy to make turns with the balancers on the bike. I put on a new set of Dunlap E3's so will have to see what the centramatic balancers does reference cupping.