I just got my rims, but before I put them on I have a quick question. The ones I got are 9.5 all around but with 255 front and 275 rear. My question is; is it wrong hat I got the same rim size all around. B/c the factory wheels are diff in size for the front and rear.

 

should be fine with the same size rim on all cornners. Its the tire sizes that matter.

 

Oh and what are these, the feel like plastic, so I don't think they are spacers, should I even use spacers.

 

what is that^^^

 

No.

 

hubcentric ring use them. it just makes sure the wheel is centered on the hub properly

 

I think you might want to put those on the car.

 

is it dangerous that they are plastic and plus do I need to use spacers

 

No.

I doubt it. Do the wheels clear the brake callipers? Do the tires rub the suspension?

 

The need for spacers depends on the offset of the rims. You did verify the offsets before buying, correct?

 

Why do the stock wheels have diff sizes from front and back.

 

For handling. Drive wheels being in the rear, they need more rubber

 

Exactly so shouldn't my new wheels have been smaller in the front?

 

Doesn't matter the wheel matter (for the most part). What matters is the rubber on the ground. Even though the front/rear wheels are same size, doesn't mean you have to have the same width tire on both. It depends on the use planned for the car as to what tire size.

 

Ok last question is ok that the rings are plastic aka are they more likely to break

 

Plastic is just fine , when installed it will have equal force all the way around. There really no load bearing either.

 

its all good plastics fine

 

I wish someone would answer my question though, why are the factory wheels made bigger in the back. I understand that tires make the difference, but still why are the factory rims diff sizes, why didn't they just do the method I am using(like many others on the forum) which is to have the same wheel size all around, but with diff size tires, thanks to anyone who can answer this question.

 

 

The plastic rings are centering rings. They go in the back side of your rim and keep it centered while you tighten the lug nuts. This will help them stay centered that is it. It is not a spacer.
The factory uses different size rims for the perfect fit for the different tires. If the factory uses different size tires/wheels it is to help reduce oversteer.