What is this little ring purpose?

Ok, got it! But what is the purpose of reversing the shaft?

These motors were designed for RC airplanes etc., so in some situations it is more suitable to have the shaft reversed. For esk8 there is no reason to reverse.

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That is used for when your using motor with propeller for r.c. airplanes. Regular esk8 motors dont come with that piece.

Are those the 6374? If so those motors are capable of running an extended shaft. It goes through the whole motor and out the back of the can. You can essentially have dual wheel drive with it. I vaguely remember someone posting a thread about it months ago.

Edit: I may be mistaken as that thread may be on another site.