i cant for my life figure out the sizes with rims

[Munnugles]

ok so im definetly a newb when it comes to sizes and all of those sorts...
so im thinking of buying rims either 18.7.5 or 18.8s... im most likely going to slap on some 225/40/18 tires... i am also on cobb lowering springs... basically im an not sure at all how the offset works and how i would know that i will not rub...
im thinking about the Rota P45F 18" x 8.0" rims they have a 48et offset and 21lb from **********
or the ROTA Wheels Subzero 18"x7.5" rims they have a 48et offset and are 21.5lbs from racinglab
also what is our hub bore so i can make sure they also fit the car
the subzeros are 56.1mm will that fit? im not sure what the p45fs are

i searched but couldnt find anything that i could understand... i even tried using the tires/wheels calculators but couldnt figure it out for the life of me

if any one has these rims possible on a sliver ms3 post a pic up (or if you have them on any speed 3 so i can see the actual color of the rim)

thanks in advance for any help

[mountjonas]

if you're buying rotas, get them from wheeldude. they'll give you wheels in the proper fitment (offset and hub bore)

[Munnugles]

ok does anyone have a picture of the rota p1 hyper black rims on siver or at least a pic of hyper black cuz im not exactly sure what they are... if it wasnt for the red lip i would be all over the other rota p1 in flat black

[Young Roids]

I don't think a 56mm hub bore will work. I think we have like a 65mm bore so you will nedd 65mm or bigger.

[Kain]

The center bore is 67.1 mm. Anything smaller you can get machined out (within reason). Anything bigger, just get hubcentric rings.

[Munnugles]

hmm ok... with 225/40s i wont rub though on cobb springs... anyone know if i do that size with the 18x8 rims how much more wheel gap i will have cuz well... wheel gap sux

and anyone know any other sites with somewhat cheap good rims, and a pic of gun metal rims on a silver...?