Fallbrook sits in the mild temperate band that covers this whole service area, so we're not fighting freeze-thaw cracking or road salt corrosion the way colder regions do. What we are fighting is age. A door built around 1980 is pushing 45 years old, and steel rollers with worn or ungreased bearings on a door that old have usually gone through several thousand open-close cycles with the original hardware still installed. Nylon rollers weren't standard equipment on doors from that build era, so a lot of what we find is the factory steel roller, flat-spotted or cracked at the bearing race, still doing its best on a track that's collected four decades of dust. Sun exposure on an unshaded track and the sheer number of cycles on an older door do more damage here than weather does. Dust and grit working into an ungreased bearing is the other common culprit - it's slow, it's quiet, and by the time it's grinding you can hear it, the bearing's usually already gone.