Garage Door Roller Replacement

Both are a wheel on a steel stem, commonly on ball bearings though standard nylon rollers can be bearingless; the bigger difference is the wheel material. A steel wheel is tough and suits very heavy or commercial doors, but steel on a steel track is loud and grows louder as bearings wear. A nylon wheel wraps a tire around the hub, absorbing vibration rather than passing it into the track, so the door runs more quietly and the wheel never rusts. For most residential doors, nylon is the usual recommendation.

The nylon tire itself needs none; spraying it or the track only collects dust that grinds the wheel. The hinge knuckles and stems where they turn benefit from a light coat of garage door lubricant once or twice a year, worked in by running the door. The ball bearings themselves are lubricated only where the roller's own maker calls for it, since some nylon rollers should not be greased there. Rollers with sealed bearings come greased from the factory and need only a wipe and a look.

The wheels themselves are usually the same, but their home is not. The bottom rollers sit in the bottom brackets, which also anchor the lifting cables and therefore carry the counterbalance load whenever the door is closed. That is why manufacturers put warning labels there and why this position is handled by a trained technician who either exchanges the roller without disturbing the bracket or relieves the spring tension first. It is also the position most exposed to salt and slush, so it is inspected with extra care.