Garage door rollers wear out from constant use, especially in damp coastal climates like Metro Vancouver where corrosion accelerates degradation. The first sign is often noise—grinding, squeaking, or a rhythmic clicking as the door moves. This happens when the roller bearings seize or the nylon or steel wheel develops flat spots from misalignment or lack of lubrication. Visually, inspect the rollers where they meet the track; look for cracked, chipped, or missing rubber on nylon rollers, or rust and pitting on steel ones. If the roller wobbles sideways in the shaft or doesn’t spin freely when turned by hand, it’s failing. You might also notice the door jerking or hesitating at certain points in its travel, particularly when opening or closing, as the damaged roller binds in the track. Another indicator is the door appearing crooked in the opening when stopped mid-travel, which suggests one side’s rollers are more worn than the other, creating uneven pull.