OEM Haibike FLYON Sprocket Fixing Nut Tool for all Haibike FLYON electric bike models. It allows you to remove the front sprocket on all FLYON e-bikes.
Just thought I'd share this discovery I made somewhere on the web (it may even have been EMTB!).
You can remove the chain ring nut on the flyon using a normal 12 point 50mm socket.
This one on ebay is the exact fit...
(In fact I would suggest Haibike made it that shape for that reason, and some smart person lured us down a £70 "special tool" route just to make a few £'s!!!)
Just taken mine off, dead easy - it was only hand tight so no need for ratchets, 3/4" drives, etc.
As others have said make sure you turn CLOCKWISE to remove the nut (it's a LH thread).
And don't overtighten it putting it back on, mines just a 'good' hand tight fit - anything too heavy handed and you risk stripping the fine threads on the nut.