install bearings,tighten nut fairly tight, spin wheel to center bearings, then back off nut nut till its free, spin wheel and retighten till there is just a little pressure on bearings,spin wheel again to see if it turn free with no side to side motion, a tapered bearing that is set up to loose will let the rollers turn and run side ways in the cone and ruin the cage that holds the bearings in positiom