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Old 03-02-19, 03:08 PM
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That looks to me like one of the Shimano hubs. Similar to the: M475 or M525 hubs.

I think it is a 12mm Allen wrench that you need, but I just use whatever fits. Standard Counter-Clockwise turning.

However, as I understand it, the Shimano freehubs are a unit not meant to be disassembled. Some people have "flushed" them.

I think people use a fork shaped tool made out of an old socket to disassemble them.

Or, here is an aftermarket tool.

You may not even need to remove the freehub from the wheel to disassemble it. But, be prepared for lots of small parts.
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