From the very beginning of manufacture, Matt...1902, because almost all early 20th Century motorcycles had a belt which ran directly from the crankshaft to the rear wheel with no transmission, and a ratcheted tightening pulley which would engage the power to the rear wheel.

Yep! Just like a good Single Malt Scotch, you might call me "an acquired taste" TOO.(among the many OTHER things you may care to call me, of course)