Rotating The Assembly By Holding The Levitating 
           Disc Against A Spinning Bicycle Wheel.


By  turning the bike upside down , and using the peddles to get the wheel to a fair speed,
and holding the disc against the tire, the resistance can be measured approximately.

          When the magnet faces are 19   mm apart the disc takes 122 seconds to stop.
          When the magnet faces are 16.5mm apart the disc takes 114 seconds to stop.
          When the magnet faces are 14   mm apart the disc takes   92 seconds to stop.
          When the magnet faces are 11.5mm apart the disc takes   45 seconds to stop.