Explanation needed on Wheel Spacers?

I want to get some 315’s out the back someday and I was wondering if I should put wheel spacers in.

I noticed 04 Sleeper put ¼ MM Wheel spacers in the rear. Should I do that?

What are wheel spacers?:shrug:

What are the benefits of wheel spacers?:shrug:

Who needs them?:shrug:


Sorry if its a lot of questions:flag:
 
they push your wheels further out of the fenders.. its mostly all looks unless you go crazy fat with your tires.. if you get some get hubcentric style.. i had 2" on my car and it shredded my tires witin a few days ... so lesson learned, dont go to the extreme lol