I bought regular grade 12.9 studs, not titanium. I like them for swapping wheels and run stud conversions on my personal cars. I have not had any problems other than buying a cheap set many years ago. Some racers change them periodically but racing puts a lot of stress on them. The ideal conversion are the integrated hub stud conversions with the studs pressed in from the back side like a factory would install studs, but these are much more expensive.
I bought 80mm and honestly think they are a little too long even with spacers. I’d estimate 60 without diapers and 70 with spacers would look better.
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