This region sits in a severe cold climate band, and that matters for roller material more than people expect. Plastic or nylon rollers get brittle in sustained cold and crack at the hub, especially on doors that see a lot of open-close cycles through winter. Steel rollers don't crack that way, but they're noisier and they wear bearings faster without regular lubrication - something a lot of owners skip once a door is a few decades old. On a 1970-built house, you're also dealing with original track that was sized for the original roller, so swapping in a different diameter or stem length without checking fit is how you get a door that rattles even with brand-new parts. Cold makes every existing clearance issue worse, because metal contracts and tolerances tighten right when the door's being used the most.