X-SYNC Aero 48T Direct Mount Black Used

The SRAM X-SYNC Aero 48T is a road single chainring created for riders who want a straightforward 1x drivetrain with an aerodynamic shape suited to riding against the clock. Its solid Aero design is engineered to reduce air resistance, a useful consideration for time trial and triathlon builds. It is a specific chainring rather than a complete crankset.

SRAM X-SYNC technology uses alternating wide and narrow teeth, often called a narrow-wide profile. This design encourages positive engagement between the chain and chainring, helping keep the chain in place while pedaling. The aluminum construction is finished in Blast Black, with laser-etched details that are designed to provide a longer-lasting finish.

An SRAM 8-bolt Direct Mount fitting connects the chainring to compatible road cranksets using this mounting interface. Identified by part number 00.6218.016.000, this specific model has 48 teeth and is intended for 12-speed SRAM Road 1x drivetrains. Checking both crank mounting and chain compatibility before installation is essential: other X-SYNC chainrings may use different fittings, tooth counts or drivetrain standards. Direct Mount should not be confused with a conventional bolt-circle chainring attachment, even when the overall diameter looks similar.

The Aero body and X-SYNC teeth address two different aspects of the same component. One aims to limit aerodynamic drag through the chainring's broad outer surface; the other helps manage chain engagement in a single-ring transmission. That combination makes the model suitable for selected road, time trial and triathlon configurations using the specified fitment. This listing refers solely to the black 48T chainring, not to crank arms, a complete crankset or any power-measuring hardware. For a replacement or a purpose-built 1x configuration, matching the exact part number and SRAM Direct Mount standard is the reliable starting point.