Description Velo Orange Thumb Shifter Mounts allow you to turn your down-tube or bar-end shifters into handlebar shifters. A huge improvement in safety & functionality for any bike really. These thumbies put your shifter within easy reach while avoiding the complexity of STI shifters. They can even be used on drop bars. Velo Orange Thumb Shifter Mounts Features & Specs Compatible with any standard road, MTB, and city handlebars (22.2 and 23.8mm diameter) Hinged design so you don’t need to remove any components or accessories for installation Integrated barrel adjustor to dial in cable tension on the fly They fit Dia-Compe Downtube Shifters, Dia-Compe Bar End Shifters, Shimano 10/9/8 speed Bar End shifters in addition to a ton of vintage downtube and bar-end shifters Sold as a pair. Shifters not included! Silver finish Note: Not compatible with Microshift shifters (the shifter is too tall) or Dia-Compe 11s road/10s dynasys shifters.