This service area sits in a cold climate zone with severe winter conditions, and that matters more for rollers than most people expect. Steel rollers with sealed bearings still rely on grease to stay quiet and smooth, and cold grease thickens and resists movement. Every winter cycle - cold overnight, warmer by afternoon - puts stress on the roller stem and the bracket holding it to the door panel. Across the roughly 223,811 owner-occupied houses in this area, a large share date to the 1960s and 70s construction wave, and those garages were built to a standard that assumed steel rollers running in steel track - not the nylon rollers most manufacturers ship today. Age plus repeated cold-stress cycles is exactly the combination that wears out old steel wheels and stretches the roller stem hole in the bracket. It's not that these doors were built badly; it's that forty-plus winters of contraction and expansion will wear any roller down, and steel wears faster than nylon under sustained cold.