Re: Should I use this?
The one I have is a two bolt bracket, not a four. I had to replace the stock bolts and nuts, because they'd strip before they got tight enough to hold the bracket steady. I've never had a problem, and I've got roughly 500 miles on it.
Note that it's not supposed to be super tight on the chain. There should still be about 1/2" of play in the bottom side of the chain run. People who are having issues with the bracket falling into the spokes either don't have the bracket tight enough on the frame, or have the chain tensioned too tightly.