Should you replace your wheel studs that appear to be in good condition? Why? As these replies prove, you're just opening a whole can of unnecessary worms.
"They do break obviously." Not very darned often in street applications. Outside of severe duty off-road or racing usage, most of the breakage I've seen is a result of heavy-handed tire monkeys getting carried away with impact guns. I see lug holes torn out of wheels more frequently than stud breakage. I've run Model A hubs on my hot rods before, and my current daily driver 4x4 has nearly 500,000 miles of heavy towing and off-road use and never had a wheel stud break. If a stud ever does break, it's not like your wheel will fall off - you have several more still holding it on.
Stop looking for trouble.
