After reading everyone else's responses (beyond where I was quoted)... I think most of the "debate" is from old/poor information. What we are talking about are actually adapters. They are bolted onto the hub and then the wheel bolts to the adapter. A spacer is technically a shim that just sits behind the wheel and the original mounting us used. Shim type spacers are very dangerous and are illegal in many places. Adapter type spacers are a totally different thing and I am not aware of any legal issues with using them.
I have ran them on several vehicles and pushed them WAY harder than any road vehicle ever will. I used them in circle and drag race and have ran them on many off-road vehicles. I have seen them fail, but of them, they were cheap foreign made things that were not hub centric and had no annealing or anodizing. Even here, the failures were pulled studs (likely related to over-torquing) and possible with any stud or bolt. I have only seen one crack and it was from being loose.
I read on the interwebs all the time that these are dangerous and that they fail, but these statements are never backed up with real (and personal) experience. It's always a google searched image or an example where all the facts are not known. >>>>>>>>>>> I'll get off my soap box now.
Last edited by SS_Syndicate; 05-10-2017 at 09:50 AM.