Spacers with the studs built in or spacers that use extended studs? and why?

I am looking to buy spacers, but i am curious if one is safer than the other.

 

Depends on how think you are going. At a certain thickness point the non stud spacers become unsafe because they will leave too little thread for the Lug Nuts.

The Stud spacers also make no sense if you are only adding a few MM's as the original studs will have to be cut or replaced so the do not interfere.

 

10 or 15mm up front and 25 or 30mm in the rear

 

bump ttt...

 

what kind of wheels are you using? if stocks, i recommend 25mm front and 30mm rear as thats what im running

btw with my expereice, they're all safe. thickness should determine wether you need spacers with studs or using extended studs. i've seen more pics showing ball joint failures, then broken lugs from spacer usage [zero].