I really need somones help. I dont know anything about tires and wheels.
I found a set that I really want called sportmax 962. It's not volks I know..
It might be cheap or whatever but I like how they look and can settle for them because of my budget. I know I want 18" front and back but dont know
anything about offset 7.5 8.5 9.5?? and so on. I came across this and dont know what to choose or anything. Please help me..
I have an 05 base Z no dropped or anything everything stock.

Package Axle Plus Size
Original
Equipment Front
Rear 225/50R17
235/50R17

Original
Equipment Front
Rear 245/40R18
275/40R18

Plus 1
Staggered Front
Rear 245/35R19
275/35R19

Plus 2
Staggered Front
Rear 245/30R20
275/30R20

 

First of all, this thread belongs in wheels & tires section.

I can clearly see that you really have no clue about this
I just checked out their website and the particular wheels that you want.
You might want to find out offset numbers before you commit..because their website doesn't list offset numbers.
8.5, 9.5, etc indicate width of the wheel, so 8.5 would be 8.5inches wide.
For this particular wheels you should go with 8.5" front and 9.5" rear(BUT like I said find out the offset numbers!!!)
Most of us with aftermarket wheels run 9-9.5 front and 10-10.5 rear.
But since the biggest size for those wheels are 8.5 front and 9.5 rear that's your best bet and also only choice.
If you really go 18" wheels, your tires should be 245/40/18 front and 275/40/18

For example: 245(tire width)/40(widewall length/height)/18(fits 18" wheels)

 

^^+1 on checking on the offsets before purchasing.

 

Study wheel width and offset. There are a dozen threads here addressing the subject.

There is no need to reinvent the wheel. Find a members set up that you like. Duplicate that set up.