SRAM Apex XPLR D1You 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 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