For Ultimate Speed you need to polish the inside of the wheel bore. I've looked down inside the wheel bore with some powerful magnifying equipment. Take my word for it... it's not a pretty site

Introducing Wheel Bore Polish by Derby Champ!

Our 1 Micron Wheel Bore Polish is the BEST THERE IS !

Simply put the pipe cleaner in your hand held drill, feed a wheel on to the pipe cleaner, apply a coat of our Wheel Bore Polish (1 micron), and use the drill to slowly polish the inside of the wheel bore. When finished rinse and clean the wheel out completely using warm water and an unused, clean pipe cleaner. You will be amazed at the increase in speed you get!