Wheels are made for 1/2" shank style nuts which are a few thou under 11/16" diameter in the shank. A little honing or fitting is usually required. I usually get them to fit snug at first since they will loosen up some with use and I don't want them sloppy loose. Typically I'll use a stud to fit each hole rather than trying to fit 5 at a time. I suppose another option is to turn a few thou from the stud.