The service area sits in a cold-moderate climate band, and that matters more for rollers than people expect. Nylon stiffens and gets brittle in a hard overnight chill, and a roller that's already flat-spotted from years of use is more likely to crack rather than just flex when the temperature drops fast. That's a different failure mode than you'd see in a warm-climate market, where the same roller just wears smooth and quiet instead of chipping. On a 2004-built door in Gunter, the roller stems also tend to be the stamped type rather than a forged bracket, so when the nylon wheel finally gives out, the stem itself is often bent too, not just the wheel. That combination, worn nylon plus a stressed stem on an aging stamped bracket, is why a roller job here is rarely a one-part swap. It's usually a pair of rollers on one side plus a check of the bracket that's been carrying the extra load.