RPM True-Track A- Arm Conversion - Revo Black The RPM True-Track Rear A-arm Conversion Kit for the Revo eliminates some of the biggest headaches associated with toe link rear ends. Rear toe angles are nearly impossible to set accurately and there isn't a gauge currently made that can accurately identify whether each individual wheels toe angle is set correctly in relation to the chassis. The RPM True-Track rear end kit completely eliminates the rear toe links, locking in the rear toe angle at a solid 1.5 degrees per side for a total rear toe-in angle of 3 degrees. By getting rid of the rear toe links, RPM has completely eliminated all rear bump steer! That means the rear toe angle remains consistent throughout the entire range of suspension travel, providing superior rear end tracking regardless of the terrain.