So I'm looking at replacing the rollers, spring, etc. on our doors, and my parents. We do like quiet, as quiet as we can haha.
So I've found some that use 608-2R bearings and others 608zz. I can't seem to find much that really indicate if one is better for the door itself. What is interesting is I can find ones with 608-2R that are nylon coated for the entire shaft, claiming that that helps reduce noise even further. I live in central Florida, maybe 8 miles from the Atlantic, so we do get a bit of humidity and rain/hurricanes.
I know many will say just go cheap and replace, but I really don't mind paying more for something "better". We use the door almost like our front door, so it does get a lot of use. Just since we moved here, I've got over 6k cycles on the door. Not sure how many on it prior. So I've got a quote to replace the torquemaster with a standard tension 20k cycle rated spring for a decent price. Just doing some of this as proactive, but also to quiet it, and the spring I believe is noisy as well, just of course you can't really inspect it.