Originally Posted by
Darth Lefty
The wrong way it can buckle, the right way it can’t. Follow the directions. Eeesh
FWIW, brakes are way more powerful than legs. Don’t screw around.
The problem here is that the OP's disc has the direction arrow opposing the normal mounting convention for disc rotors. It's not made out of some magic material, so it's obviously a production error. I would mount it like any other disc, i.e. ignore the arrow in this case.
Is it actually dangerous to mount it the wrong way round? I wouldn't like to answer that 100%, but as a qualified mechanical engineer I wouldn't expect it to assplode.