650 what? is that one of those mountain bikes with the drop bars for doing endos at the slightest bump in the road?
only guy i knew who could ride one of those without a 3rd degree LCR separation was Roger de Vlaeminck.
what about those front derailleurs with no cable but just a lever?
or what about wearing gloves and just reaching down with you hands to change sprockets? lightest derailleur ever me thinks,