Wheel stud size should be tied to the performance level of the car. If you're still rolling on tires from the late 60's or early 70's, then 7/16-20 studs are more than adequate. If you're cramming super-sticky compound ultra-high performance tires on your ride, then it's time to upgrade to M12x1.5 or 1/2-20 IMHO. Most P-T rides are also getting set up with stiffer spring rates, roll rates, lower CoG, higher HP engines, etc, so that the added traction can be put to good use, thus making larger wheel studs relatively inexpensive insurance against what could be a relatively ugly failure.
Most aftermarket wheels are designed for 60 degree conical seat lugnuts and have a .600" or larger through hole for the stud. These wheels will typically accommodate up to a 9/16" or M14 wheel stud, however M12x1.5 or 1/2-20 are typically more than adequate for most P-T builds.
Tobin
KORE3
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