Ok it was the first mass produced bike with tubeless tyre's the first were supplied with tubes to ease customer fears,The Honda CX500 was the first production motorcycle to be produced with tubeless tyres from the factory. ... There aren't really a lot of convincing reasons to do so, and rather a few to not - tubeless tyres are a notable improvement on the old tubed design.So that wasn't in the 1920s, then?
"I regret not having a motorcycle development thread here" :) to keep on-topic (although there are many similar all over the 'net).