Imagination is the only limitation to how much the microSHIFT thumbies can do. Their small minimalistic designs are packed with precision machined mechanism that allows you to shift accurately with either index or friction mode. Go on any adventure without worries for mechanical issues.Features-Include shift cablesItem Specifications-Shifter Style:Thumb-Drivetrain Speeds:8-Double or Triple:Double,Triple-Front Der/Shifter Compatibility:Friction