I don't know what to say about the busted rollers I have had no problems with mine in 200-300 miles. I have had my ring pop out while ridding and its no big deal other than my chain getting loose. Somehow my axle slid forward making my chain looser than normal and when accelerating the GR came out. It makes a weird clanging noise when it hits the ground and then it becomes a game of chase and find, mine rolled half a block before it stopped. All in all it came out three times before I made it home the fix the problem, each time it came out was much the same, it doesn't come ripping out like a buzz saw...Kelly