Thanks for all the help. The question was not written well, i meant that my frame has 5.5" of travel. The shock was supposed to be a 7.875 x 2.0, but I found a great deal on a longer eye to eye x 2.0, and on a 7.875 x 2.25. Unfortunately neither is the right size. I think Im going to try the one with the longer stroke because my frame, cannondale prophet, has 2 shock mount positions and through some measurements i have determined it will work in one of them. Thanks again