[grsnovi]

The "things" that appear at random around the tread are probably graphical anomalies that may have to do with sketch integrity. Can we assume that your wheel is an assembly or did you model all of the parts as features within a single part? As JD suggests, if you can post the tread part here, somebody could look at it. It would be good if prior to posting you rolled your end of part marker all the way up to the top and then post a zip file of that.