alternatehistory.com

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.
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