The original Thumbies launched earlier this year for use with road bike derailleurs, and now there’s a mountain bike version with enough cable pull to move Shimano’s MTB derailleurs through their range.
Technically, it’s the Microshift Bar End shifter that handles the cable pull, the difference here is that this new version fits the Microshift levers, giving you an option for running MTB derailleurs. The update earlier this year actually did the opposite, updating their original original Thumbies to use Shimano’s road-oriented thumb levers. So, no you can run whatever you want…
The clamp is hinged for easy installation and the mounting platform is raised to clear hydraulic brake lines. They’re designed to fit 22.2mm handlebar diameters, the standard measurement out by the grips. With a little finagling, you could probably even get them to fit on the upper section of a drop bar to run MTB drivetrain parts on your offroad adventure/gravel bike. Get them for $42 a piece or $79 for a pair in polished silver or black anodized. Weight is 60g each. Shifter levers sold separately.