Nut and bolted them no movement, drove them about for a while, gentle braking and hard braking, took the wheels back off and they hadnt moved or loosened, so im happy to leave them like that, if they start to vibrate (which I dont think they will) then will get them threaded. My bro did the same with his Hi-Spec brakes and he has done numerous track days and been to the ring twice and has had no problems.