Interesting, the center shaft remains stationary and the entire engine rotates around the hub taking the wheel with it. Challenges include feeding fuel from a stationary tank to individual rotating cylinders, and it's got to be loud.
2011 Triumph America (10/2011 to 07/2014)
2012 Harley Davidson 1200C Sportster
2014 Harley Davidson Dyna Wide Glide
