Traxxas 5223 TRX 2.5 engine bearings are precision replacement internal bearings designed to restore smooth, reliable operation in your nitro engine’s crankshaft and rotating assemblies. Made from high‑quality steel, these bearings help reduce friction, resist wear, and support consistent engine performance under high RPM and load conditions. Installing new bearings can improve throttle response, reduce vibration, and extend the life of your TRX 2.5 engine by maintaining proper internal tolerances and rotation. This complete bearing set installs directly into the engine using standard assembly procedures and hardware.