No arguments here... just trying to see why they're such a bad idea?

Many people use spacers from H&R or Ichiba that bolt to the car and then the wheels bolt to the spacer with no issue at all.

Why are these "spacers" that bolt to a 4x114.3 car that have 5x114.3 bolts sticking out for the wheel to go on it such a bad idea in comparison?

Is there some kind of negative phyisics involved with holding on to 4 bolts but providing 5 out thats the issue?

assuming no ebay specials but a decent brand... (dunno if it exists just asking)

 

or eibach. i run eibach 15mm spacers on my mazda that are the system four, which means they are studded spacers.

they aren't conversion spacers, but i'm just saying that i run spacers that literally hold the wheels on the car.

 

It changes the offset. Our FWD Hondas use a higher offset wheel stock, then you tack on a thick lug pattern changing adapter in place and you need really really high offset wheels just to put the tire back in the correct place.

Yes, there are negative physics as well. In theory, it should increase the side load on the wheel bearings, as wheels of a high enough offset probably won't be used. It also changes the scrub radius. In reality, the wheel bearings can probably take the load just fine, and any change on offset changes scrub radius, so it isn't a big issue.