I have no experience working on one of these. Could you please post a picture so we can see what you are talking about?The freehub is what I have but it is a different size diameter, it is larger than normal. The first 6 gears slide on like a normal cassette would, but gears 7 and 8 are fused together with internal threading in them, these gears screw onto the freehub body to clamp the cassette down. Is there anyway I can get the freehub replaced with the smaller correct size by taking the one I have off the hub?
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This one is the best idea for using existing parts.Tear the cassette apart and use the ramped cog of your choosing (even though it wont be ideal), make spacers from pvc pipe and ride your bike