SRAM XPLR XG-1251 Cassette Racks The X4 starts life as

The X4 starts life as a one-piece 7000 series extruded billet precision solid block of aluminum

It's built to be stiff enough to really take some welly but flexible enough to reach those tricky spots

Extra wide range 12-speed drivetrain -10-51T (12-speed)

Compatible Bikes: E-Bike

Thinner bottom-out bumper

SRAM XPLR XG-1251 Cassette Racks The X4 starts life asSRAM XPLR XG 1251 12 SPEED CASSETTE Make that daily ride from your front door a little spicier with some dirt. The 440% range of the XPLR XG 1251 cassette provides smooth gear progression when youre sweating up gravel climbs, and tight jumps on the high end for when its time to drill it on asphalt. Shift features on each cog are optimized for electronic shifting, so youll get fast, smooth and precise shifts every time. SPECIFICATIONS Speeds 12 Speed