Built to withstand the harshest riding conditions, the SXg provides maximum chain retention, keeping your drivetrain secure and your momentum flowing, even on the most technical descents. Providing upper and lower retention, the SXg ensures optimal chain engagement and stability, and kills chainslap and noise for a smooth and silent ride. Whether you're racing the clock or pushing your own limits, the SXg ensures an uninterrupted ride from start to finish.