Hello, I was wondering if it was ok to run 245/40/18 in all four corners.

I did some math and figured with 18in wheels and a 245/40 tire I will be ~39mm (about 1.5in) higher in diameter then running stock wheels/tires. I've got a drop via nuespeed so the extra .75in off the ground is welcome. And the car is daily driven and not meant to be fast so the "longer gearing" is not a problem either. But my main concern is are they too tall? Tall enough to rub?

Stock
16in rim (406.4mm) dia
245/45/16 tire (110.25mm) in height
Total = 516.65mm

New setup
18in rim (457.2mm) dia
245/40/18 tire (98mm) in height
Total = 555.2

Difference = 38mm
Thanks

 

1. Stock for the rear is in fact, 225/50/16, which is 24.9" (same as the OEM 205/55/16). The usual aftermarket rear tire sizing is 245/45/16, which is 24.7" in diameter.
2. A 245/40/18 tire is 25.7" in diameter.
3. A 225 tire in the proper size on a rim that is suitable for the front (17", 55mm offset, 7.5" width) on a stock height S2000 will just rub the splashshield fastener. A dropped car with 245 tires up front will prove to be a nightmare and you haven't even stated what rim specs you plan to use.

 

Hmm, so my math is all wrong... How are you getting these diameters? I used a 16in rim converted it to mm and then added the sidewall on top of that, for example 225/50 would be like 112mm high. So I geuss I'm looking at something wayyy skinnier if I want to use it for daily driviing.

Well, I will be using 18x7.5 +45 (these are what I'm looking at currently) all around... What would you reccomend?

Thanks for your insight!

 

So I geuss I can compensate for the +45 offset by using a 215 tire? What would you suggest for the rears? Again thanks, I am a noob when it comes to this stuff. On my rsx I could literally close my eyes and pick a rim with random offsets and i would be fine. (Ran a 235/35/18 with god knows what offsets with no problem).

 

Disregard the rim when calculating the tire diameter. It's the tire diameter that matters. You will find the following useful in determining what you should be running:

http://www.miata.net/garage/tirecalc.html

https://www.s2ki.com/forums/index.ph...&f=56&t=342793