Thumb Shifter MountsDescription Don't throw out those vintage downtube shifters they're the perfect match for city bikes, tourers, and porteurs! They're lightweight, simple, inexpensive, and are compatible with almost any front and rear derailleur. Although, they can be a pain to reach for in traffic. The VO Thumb Shifter Mounts allow you to mount downtube and bar end shifters on your handlebars. These thumbies put your shifter within easy reach while avoiding the