You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser.
In the 1930s very few motorcycles had rear swing arm suspension. In 1930 Matchless introduced their cantilever rear suspension.
Others soon followed, and by the mid-1930s these included New Imperial, UK.
Here’s some history on the swing arm and on Velocette leading the charge
https://thevintagent.com/2018/02/13/whence-came-the-swingarm-frame/
So, how do we get the swing arm into earlier adoption? I’d say regulatory is the way to go.