Actually derialleurs had been around for a long time, French cyclo-tourists had been experimenting with variable gears since the start of the century.
I think the issue was which one came first, spring-loaded, cable-actuated derailleurs or the Cambio Corsa.
@withered_preacher started
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I think the issue was which one came first, spring-loaded, cable-actuated derailleurs or the Cambio Corsa.