You want your bike to do everything, so you need gears that can do everything. The Apex XPLR derailleur hits the sweet spot of smooth jumps over a big gear range, all with unmatched chain security and the simplicity of a 1x drivetrain. Quietly and quickly shift across our 12-speed cassettes with 44T large cogs, knowing youll have the gears you need.Compatible with cassettes with 44T large cogsUse with Flattop chainWorks with 12-speed mechanical Apex and Eagle shiftersClutch controls chain tension for consistent shiftingX-HORIZON straight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift forceCage Lock technology makes for fast wheel changes or chain installation