A door built in 1982 was almost always specced with steel rollers on steel track, standard for that build era across this part of the valley. Steel rollers don't fail quietly - they chip, flatten on one side, and start grinding against the track, which is usually the first sign a Rialto homeowner notices before anything else goes wrong. At roughly $85,521 median household income here, most of these houses were bought as a long-term hold rather than flipped, so the original door and hardware often went 30-plus years without anyone touching the rollers until they started screeching on every open. With 26,856 households in town, that's a lot of doors sitting in the same window where steel rollers are due for a nylon swap, whether the owner's noticed yet or not.