[QUOTE=bobotech;14256695

Its not the cassette that matters, its the freehub. You need to make sure your current wheel has the larger 8-9-10 speed freehub on it to take the 8 speed freehub. That is what I was referring to in my other post. If you have a 7 speed freehub, its still doable, just a bit more work involved and you will need to get another freehub body.[/QUOTE]
Would a 7 speed freehub need a pair of spacers to fit the 7 speed cassette? The mechanic said something about the spacers being added to make the 7 speed cassette work, but I don't remember exactly what he said. Will the new cassette work on the old freehub if it fits regardless of the number of spacers used? Even if it fits without any spacers?