WTF-reehub?

gt-arrowhead
gt-arrowhead Posts: 2,507
edited February 2014 in MTB workshop & tech
Just received a battered rear wheel that has a working freehub on it, and i went managed to get the axle and freehub off in no time at all in the usual way with a 10mm (i think it was) allen key. Straight in, turn, pull the lot off.

Then i got round to removing my ruined freewheel off of my own rear wheel so i can get the new one on. I removed the axle and everything, slotted the allen key in and nothing. After a quick cleaning i saw that the fitting for the bolt that holds the freehub on was not infact an allen key fitting. It looks like a splined type of fitting. It looks as if it is meant to take the same sort fitting that a cassette lockring would take, but obviously smaller.

I also tried inserting the allen key from the non freehub side through the hub as i read before i started that some freehubs come off like that, but nothing still.

Does anyone know what kind of fitting this is? I couldnt find out what it was through Sheldon Brown and i am quite confused.

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