One of the posters from Gallica's Pinterest selection
Source: gallica.bnf.fr via GallicaBnF on Pinterest
This poster for a chainless bike; that is, for a bike using a shaft drive rather than a chain, is less detailed than most bicycle posters that show the bicycle accurately. This appears to have the shaft drive on the left side of the bike, but typically it was put on the right side - the same side where a chain would run.
While there are still occasional efforts to revive shaft drive systems for bicycles today, they aren't very successful. More successful has been the effort to adapt disk brakes for road racing bikes - I was interested to see Leonard Zinn "throw some ice water" (as he put it) on this notion in his column today. My own experience with Avid cable-actuated disk brakes on a road bike (although not for racing) has been that they are more maintenance headache than they are worth.
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