ALL FOUR STUDS ON RIGHT FRONT TIRE, SHEARED OFF. RESULTING IN LOSS OF CONTROL OF VEHICLE AND TIRE TRAVELING LOOSE THROUGH TRAFFIC. TIRE COMPLETELY DESTROYED FRONT FENDER AND ROTOR ASSEMBLY WAS BROKEN WHEN CAR CAME CRASHING DOWN ONTO IT. STUDS SHOWED NO SIGNS THAT THEY HADN'T BEEN TIGHTENED TO SPECS. (ROUNDED OUT STUD HOLES ON RIMS OR ROUNDED OUT THREADS.) COMPLETE SIMUALTANOUS STUD FAILURE ON ALL FOUR STUDS. *AK