I am running with stock adjustments (readjusted to as close as possible to stock after 1.5 inch drop) 19x9.5 with a 265/30 rear no rubbing issues once the fender was tucked/rolled.

The front is another story I was originally sent +35 offsets which should have been +45 once these come in I was going to mill them down another +5mm for a +50mm offset. Front would be 19x8.5 (+50) with 225/35. Will update once all work has been completed.

 

Here are some pictures of the setup with the incorrect front rims (+35 offset)
New front rims should come in this week.

You can see in these pic the rear does just clear the rear.

 

Is milling 5mm off a safe thing to do? I would imagine you are changing the structural properties of the wheels at a critical point. Where does one get that done?

 

Have a friend in the car club that owns a milling shop.

Depending on the design of the mounting area milling off 5 mm may or may not effect the structural stresses to the rim.

Using Finite elemental analysis software I will be able to see how the removal of this 5 mm may or may not affect the stress points. I will be mounting the rim to see if there are any issues with rubbing before I go through with this. May turn out that the +45 offset does not rub at all.

 

From all the research I have done here is the max size tire you can run on the S2000 with the appropriate offsets if you can find them. This data is highly dependent on you particular suspension set up and may or may not work for you. This data helped me in deciding what was the absolute max tire size I can run based on the offsets available in the rims I liked before I made my final choice.
Instructions find the size tire you want to run front/rear then read the description to determine what offsets you can run and the consequences of the particular offsets.

FRONT
To run a
215
you would need to have a rim with an offset greater than or equal to +40
Anything less than that would require new wider fenders.

225
offset would need to be greater than or equal to+ 45
Anything less than that would require new wider fenders.

235
greater than or equal to +55
Anything less than that would require new wider fenders.

245
greater than or equal to +60
Anything less than that would require new wider fenders.

REAR

245
greater than or equal to +55
if you run a +45 a fender roll would be necessary
any offset less than 45 would require new wide fenders with a cut out of the factory wheel well. AKA (GT3 wide body kit)

255
greater than or equal to +60
if you run a +55 a fender roll would be necessary
any offset less than 55 would require new wide fenders with a cut out of the factory wheel well. AKA (GT3 wide body kit)

265
greater than or equal to +65
if you run a +60 or +55 a fender roll would be necessary
any offset less than 55 would require new wide fenders with a cut out of the factory wheel well. AKA (GT3 wide body kit)

275
greater than or equal to +70
if you run a +65 or +60 a fender roll would be necessary
any offset less than 60 would require new wide fenders with a cut out of the factory wheel well. AKA (GT3 wide body kit)


285
greater than or equal to +75
if you run a +65 or +70 a fender roll would be necessary
any offset less than 65 would require new wide fenders with a cut out of the factory wheel well. AKA (GT3 wide body kit)


Now I have seen a S2k with a 285 on the rear but is was a realy expensive rim set up +2500 per side

 

This research is based on which width of a wheel?

Steve - Evolution
703-961-9090

 

the research was based on the width (contact patch) of the tire not the rim.
The tire rubs not the rim. If the rim does rub you have bigger problems than I can help you with.

This is an example why

Taking the rear for example

Setup one
18x8.5 +55 with a 255 there would be 182.5mm of tire contact patch toward the inside of the car from the hub and 72.5mm toward the out side of the mounting hub.

Setup 2
18x9.5 +55 also with a 255 the inboard and out board numbers would be the same as above but this is assuming you can get the same tire on both rims.

Now yes if you were able to compress your suspension to a point the larger width rim could contact the fender since setup 2 rim is 1 inch wider . If this is happening you either have some major problems with your suspension or you lowered your car to far and/or did it the wrong way.

I tried to explain the equations behind this data and how it was bumped against actual installs to some of the local high end rim/tire shops here in Orlando...
They stated this was way beyond anything they would know about; they just put the new rims on and see if they fit.

There has go to be some program that does this for the big distributors of rim/tire packages (tire rack). There is no way they take every wheel that have install it on every car out there and check to see how it fits; that would just not be cost effective.

Take the info posted above with a grain of salt this info seemed to work for me when I was researching my new wheel package which I was told by a lot of members on S2ki and by tirerack that this particular setup would never fit despite a rolled fender in the rear and the set in the front would contact the suspension components in the front when making a turn.

 

I understand where you coming from but the same offset on different width of a wheel can change the entire scenrio.
That's why offset calculators ask for the width and offset of the wheels when comparing side by side.

8.5 +50 may be a agressive setup with 255mm tires but it's been done numerous times at my shop without much of a problem. We never roll any fenders either. I guess it all depends on the tire brand.
8.0 +50 definately fit with 255mm tires because I seen it myself on my customer's car.

Mark, I'm not arguing with you and I can agree with most of the data. I know you are trying to give a offset/tire reference to other owners. However, when measuring for the correct set up for wheel/tire, important factors are width, offset, tire size, and back spacing. Here is an example:

FAQ

I think back spacing is the hardest part of the equation because physical measurement is probably needed.

Steve - Evolution
703-961-9090

 

So basically saying, If I were to purchase a set of Falken Torque 5's 18x8 for the rear with 245/35 and 18x7 225/45 in the front (both a +35 offset), it is going to essentially look like the pics of the yellow car a few posts above??

If so, this seems livable...but I am a total newb at this metric tire thing...

My other vehicle is a Tacoma on 37x12.50 Swampers

 

Mark's Spa Yellow S2000 is only running +35 in the front from what I read. I don't now what is the width of the front wheels he has. I don't think many can live with wheels sticking out like that.

Steve - Evolution
703-961-9090