https://www.youtube.com/watch?v=yJPTSaARlvs

 Hubless wheel

 https://www.youtube.com/watch?v=UHoHAmrEbrk 

 McLean V-8 Monocycle (Crash 2:55)

 https://www.youtube.com/watch?v=K4YmVP6i4qw 

 Orbit wheel en Guatemala

 https://www.youtube.com/watch?v=sUXDjg6_bhM  (good christmas gift for a teenager i bet)

 The D-Drive Infinitely Variable Geared Transmission (real mind bender)

 https://www.youtube.com/watch?v=F6zE__J0YIU

 PMBO 2013 ~Russ's Final Entry Video... OVER 1/2 Million RPM NEO Sphere Air Bearing With ABHA Coil.   

 https://www.youtube.com/watch?v=o3t2390k5R8