This is evident in the R27. Its enclosed shaft final drive is rare for a single cylinder motorcycle. But it also had a triangulated Earles front fork (named after English designer Ernest Earles); so the motorcycle had a front swing arm as well as a rear swing arm.
This is clear in the R27, thanks to its unusual final drive system, which is rare for a single-cylinder bike. Additionally, it features a distinctive front fork design, called the triangulated Earles fork, also designed by Ernest Earles.