ENE GRAN COMPE BAR END SHIFTER

Ahhh, the ratcheting friction shifter. The old SunTour versions have a cult like following, but those are like hens teeth. Dia-Compe stays true to the form, and function. A ratcheting shifter that is silky smooth, and stays put. No creep in these bad boys.
They'll work with 5-10 speed freewheels or cassettes.

Nearly any speed. Nearly any derailleur. The trusty friction shifter opens up a world of tinkering possibilities.