Originally Posted by
Eggman84
Please explain how I am wrong and I have no idea what you mean by "the manufacturer wants to lose business by insisting on only using those two cassettes"? What manufacturer and what cassettes?
But to give you credit, I believe you are correct. I don't run 11 speed but if I remember correctly, the largest 11 speed MTB cog "overhangs" the end of the freehub body. So the freehub body only has room for 10 cogs, with the 11th cog attached to the 10th and overhanging. Please correct me if I am wrong. Point me to a tech document to set me right (may help the OP also).
If OneUp, the company that makes the Extenders, wanted to sell as many extenders as possible, why would they
unnecessarily limit their product for use with only the Shimano M7000 and M8000 cassettes if the Extender worked with more than those two?
Limiting the Extender to just two possible cassette models suggests that there is a concrete, mechanical reason for doing so.