Want to lock things down on the trail? This official Axial differential spool for the RBX10 Ryft converts your stock gear differential into a fully locked system, giving you more predictable power delivery when the terrain gets serious. It fits the front, center, or rear differential position, so you can tune your drivetrain exactly the way you want it. One spool included per package. A simple upgrade with a big impact on how your Ryft handles the rocks.