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Found a solution that didn't require replacing studs. Used extended thread lug nuts that fit inside of the wheel and ad .3 in of thread which makes up the .25 in of thread lost. They require a 5/8 in. dia hole in the rim that the accs wheels already had. The stock rims were 19/32, which required me to drill out the hole a 1/32 of an in. The wheels don't center off of the stud through the hole but from the 60 deg conical edge of the lug nut so centering was no problem. This proceedure cost me $60.00, which has to be alot cheaper than replacing all the studs.
I have used this set up for 4 yrs with no problems, I think you could go to as much as a 3/8" thick spacer with this I .
I use .190" spacers with factory studs and lugs and wheels, and the threads are just starting to protrude from the nut. I would say that about .2" is the max you can go before you need to change something (studs/lugs). It depends a lot on the wheels though. If you need to go thick, Doug Rippie Motorsports makes nice spacers that center on the hub, and have another hub machined onto them to maintain hub centricity. Locating off of the lugs seems kind of cheesy
I use .190" spacers with factory studs and lugs and wheels, and the threads are just starting to protrude from the nut. I would say that about .2" is the max you can go before you need to change something (studs/lugs). It depends a lot on the wheels though. If you need to go thick, Doug Rippie Motorsports makes nice spacers that center on the hub, and have another hub machined onto them to maintain hub centricity. Locating off of the lugs seems kind of cheesy