Are wheel spacers safe?

Here is the thing, I hate the look of sunken wheels on the vehicle body!!!
I plan to buy put some wheel spacers on, 3/4inch or 1/2inch, not too thick, but still, I worry about the safety.
'Cause I saw some terrible pics on the internet of the wheels jump out bcz of wheel spacers.
So I search for some proof of WHEEL SPACERS SAFETY, and here's a result that I got from the internet.
Hope there's somebody can tell me that it is true that wheel spacers are safe only if I treat them right.

 

There's a zone, I think its around 2.5-7.5mm, which on a VW 4x100PCD hub design, physically cannot support the hub centre with enough material so its inherently unsafe. Don't quote me on the zone though, I can't remember the specs.

I bought a 1990 mk1 golf cabriolet and unbeknownst to me it had 4 x 100 rear wheel spacers on when i bought it, did 10k miles with them on .doing 100mph at times never knew they were fitted never gave me any trouble

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Firstly on the rear which sits in more than the front, fit hub spacers not wheel spacers, has the same effect but dosnt load up the wheel bearing. now if vw specify et 38 for the wheels and you fit a 10mm spacer, you are in effect using an et 28 wheel, im sure vw didnt guess at the et and came up with the specific size for a reason. How ever some run a 9 inch wide rim on the front and ive not heard of any suspension failures from this (apart from maybe wheel bearings) so a sensible width spacer shouldnt cause problems. Suggest hub centric spacers and think will need at least 12 to 15mm spacer to fit over the little hub piece that the wheel fits over...

Apologies, I assumed all wheel spacers were hubcentric.

If the hub is no longer carrying any of the load with a too-wide (ie a narrow one would still have a contact area), non-hubcentric spacer then I'd say that's unsafe.

So its not a black and white. "It depends". Both on the dimensions and the design of the spacer.

I've double stacked them in my time… on many many cars. 

Never once had an issue.

I have had non-hub centric wheels on my car and noticed a wash board effect when driven…So I bought the Centering spacers and didn't have any further issues.

With wheel spacers you have to get hub centric, or the spacers that make then centric.  The Bolts (lugs) would need to be lengthened to accommodate the width of the spacer so that you have proper bolt through, as with non-centeric or centric spacers your mounting surface area is between the bolts and the hub on the front an the Drums on the back so you have to have proper bolt length, often over looked at first glance, and for the rears if they are tooo long you can ruin your brakes and I have seen some in the breakers that the bolts actually bound the rear wheels from turning, which is probably why they were in the breakers for a 12 pound fix.

Spacers aren't bad or good but the quality of the Steel, and the spacing Hub Centered is.

Ive had the bolts from the spacer/adaptor hub come loose, and turned out was too short so they actually could have fallen off. Scared me in such a way ive never refitted.

Hi Guys,  newbie here!!

Don't know if anyone can help:  I've got a set of Porsche teledial 15" 5x130 to go onto my caddy.  I've also got some G60 callipers to go on - I need to get some hub adaptors 4to 5 stud.  Are there 5 stud discs 280x22 that will work on this set up ??

Thanks in advance

Have a look at corrado vr6 discs think they may work.

Brilliant thanks Carl