If you've been working on your bike for some time, you're very familiar with the simple derailleur hanger and its importance to the quality of your gear changes. The HAG has been an essential tool in Abbey's catalogue for a long time and its precision is unmatched in the industry. But what if you just want to check derailleur hanger alignment quickly and easily without removing your rear derailleur? Here's the 3D-printed preHAG!

This simple tool is designed to quickly see if the derailleur hanger is parallel to the sprockets. It simply presses and attaches to the largest sprocket and hangs to give you a reference plane for judging correct alignment. This is not intended to replace the precision of a HAG, but to add an extra step that requires no disassembly of the bike for quick checks before your rides.