I tried this one but it did not work. Jesse swore that it should but the chain woudl rub the upper block. It was very close and I think that I had it adjusted properly (there were more than one set of holes that I could have mounted it with). I think that it was set up for the 43 tooth rear and I had the 41. I am sure that the chain would have rubbed itself free in a couple of rides and been fine. But this was the first thing I fixed on the bike, and I was reluctant to go that route. It was a high quality unit.