These are simple, inexpensive friction shifters that are perfect for upright, swept-back or flat handlebars. They work best with Shimano, SunRace, SunTour or other derailleurs that use a 2:1 pull ratio. This includes just about anything except Sram's 1:1 systems. The left hand (front) shifter works fine for double or triple chainrings. The right hand (rear) works great with 8 or fewer rear cogs. Comes with cable and housing to fit most bikes. Need the pair? We sell them as a set for a few bucks cheaper here.