Kguy17

I know there is an offset/wheel figment guide but I had a specific question(new to this). I have 18" wheels 7.5" front and 9" rear. Front is 215/35/18 and rear is 235/40/18. Will these rub at all at STOCK height? I really don't want to camber or roll the fenders unless I absolutely have to. BtW I don't want to lower it because it's a pain with my driveway. Thx in advance!

s2k4life_az

Depends on the offset and aspect ratio of the tires you put on them. You should go with 245 in the rear though.

Kguy17

Thx for the reply! Tires look pretty worn so I'll take the 245 in consideration when selecting new ones.

kryptonite

^What he said.

Here's an easy way to figure this out

Part 1. For tire + wheel height, you're right now running probably 215/45/r17 (mm/aspect ratio/wheel size) and 245/40/r17
The 45 or aspect ratio gives you the ratio of the width of your tire (215 or 245) to the height of the sidewall of your tire.

So the height of your front wheel + tire was 2*215mm*.45 + 431.8 (17inches in mm) = 625.3 AND 2*245*.40 + 431.8 = 627.8
(note I multiplied the sidewall height by two because when you say draw a straight line from one side of the wheel to the other you pass the tire twice)

Your new tire + wheel height will be 2*215*.35 + 457.2 = 607.7 AND 2*235*.35 + 457.2 = 621.7

Long story short, you're actually going to drop the car a tad bit because the aspect ratio of the new tires are so much less than your stock wheels.

Part 2 offset. Less calculation more using an online tool

http://www.1010tires.com/Tools/Wheel-Offset-Calculator

Plug in the numbers of your current wheels. If they're AP2 stock
Front:
17" x 7.0", +55 offset
Rear:
17" x 8.5", +65 offset

Plug in the width and offset of the new wheels and it will tell you the difference. Take some calipers if you have them or any conventional measuring tape and see how far in our out they stick. You don't really have to worry about tire height in this case because you're losing height.

Kguy17

Some good info, I'm learning lol.

Manga_Spawn

Also those tires are completely the wrong sizes for the S2000. They should be 215/40/18 front and 235/40/18. The 235 is actually an odd size and I would avoid running it. 40 series is taller than OEM and 35 series is shorter. There also isn't a ton of tire choices in this size due to it being an odd size. The sidewall on that front tire will be almost non existent. Depending on the offset you should be able to fit a 245/35/18 rear which would be the better choice and a 225/40/18 front again depending on the offset.

s2000Junky

225/40/18 ^^ he meant for front. Not 17.

Manga_Spawn

Fixed.

Kguy17

Ok, took a chance and drove it to work today and hit a fair amount of small bumps on the way and there seems to be no rubbing. I'll have to drive with caution I guess, Thx for all the good inputs!

Manga_Spawn

Small bumps aren't going to do anything. You also ignored the fact that your front tires are the wrong size. You also didn't post the actual offset of the wheel. But I guess you are fine hearing I told you so when it damages your car.