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 worrying about mechanical issues. - Indexed or friction mode-convertible rear shifter - Compatible with SRAM MTB systems - Shift lever and bracket built with anodized cold-forged aluminum - Includes stainless slick shift cables - 19.0 - 22.0mm clamp band