SRAM Apex XPLR 12spd Rear Mechanical Derailleur

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.

Key Highlights Are
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

Features
Speed (RD): 12spd
Cable pull ratio: X-actuation
Cage (RD): n/a
Max tooth: 44
Colour (RD): Black
Pulley bearings material: Steel
Cage material (RD): Aluminium