4x9x4 Motor Bearing (Standard)

Product Overview Front bearing for Hobbywing XERUN V10 G4 motor   The 4x9x4 Motor Bearing (684ZZE) is part of our motor bearing lineup which is specifically designed for performance and longevity in RC motors. We utilize *chrome steel rings that are polished to a mirror-like finish in order to reduce noise and vibration. Then you couple that with a very tight ABEC7 tolerance to ensure there is as little play in the bearing. We use a nylon cage instead of metal so it doesn't expand under heat, allowing for more performance. Lastly, we use high-speed oil for nearly frictionless rotation and metal shields to reduce contact on the races and to keep debris out. Specifications ABEC7 tolerances allow the rotor to maintain its location while under loads. Deep groove chrome steel 52100 rings with a premium surface finish, smoother than stainless steel for better performance. Nylon cage instead of metal so there is no expansion from heat, keeping friction to a minimum. Lubricated with high-