Rear derailleur APEX XPLR.FEATURES:-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 you´ll have the gears you need.-Compatible with cassettes with 44T large cogs.-Use with Flattop chain.-Works with 12-speed mechanical Apex and Eagle shifters.-Clutch controls chain tension for consistent shifting.-X-HORIZON straight parallelogram design limits all movement to the horizontal axis, which makes ghost shifting impossible while also reducing shift force.