245 square setup... Need advice
 

Looking at getting a 245/40/18 tires on a 9.5 wheel. Just wondering if that is the best way to go to improve traction and handling. With the vortech kit on a 3.125 pulley I would assume the wide tires are suitable for the application. Probably going with the direzza z2 for tires and enkai raijin for wheels.

255/35/18 at least. 245 is stretched on a 9.5.

If you want traction, 255 or 265 is what you want.

don't you already have a similar thread running? I believe CSG Mike is helping out plenty there...

245 is good for 9.0 or 8.5

So 245 front with 255 in the rear?

I second going with 255s on 18x9.5 square. My offset was 40mm. No rubbing issues while turning lock to lock. I'm also on Stance Coil overs.

Attachment 72093

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seems like you see some poke on 255 with the 18x9.5 maybe a 10 would be better?

Even if you run 245, go 245/35R18 instead of 245/40R18.
If I were you, I would run 255/35 on 9.5 rims.

Because 1 thread isn't enough to answer his question. It needs 2 side by side, real time updates.

-alex

running 255/35/18 on 18x9.5 +40 no rubbing issues. this is with -2 camber all around though from my previous setup on 17s. What is you reason for wanting 245? it seems like you really want to run it that way..

At 25.7", the ZII in 245/40-18 is 1.0" taller than OEM; you may have rubbing issues.

The tread width of 9.5" matches your wheel width; this is good. For handling, the rule of thumb is that the tire's tread width be +/- 1.0" of the wheel width. A wheel width greater than the tread width will generally favor handling. Wide tires on narrow wheels are to be avoided if handling is your priority.

The 9.5" tread width of the ZII is more than sufficient for your power; it's not too much and it's not too little.

Ok so you saying a 255/35/18 would be ideal for my wheel? How much negative camber should I run for improved handling?

In the ZII, that would probably be a better tire for you to run as it's only 0.3" taller than the OEM tire, and its tread width of 9.6" maps well to your wheel width of 9.5". As an aside, does it make you wonder how it is that a 245 Dunlop ZII has a tread width of 9.5", and the same tire in 255 has a tread width of 9.6"?

I have no idea what camber you should run; use tire temperatures to guide you on that - after you use Mike's guidance on initial camber settings.

Does it matter between 9.6 and 9.5. I'm thinking of actually going with a 235 upfront with 255 in the rear due to the tires following the groove of the wheels.

Not sure if that messes with the tread width.

I guess it also depends on if you're going to track your car. I'm running -1.2 in front and -1.5 in back for my daily driver and it's been great handling wise. It feels definitely much better than stock.

245 is perfectly fine, but it's just not as fit as 255

I went with 255. Some went with 225 on 9.5! =="

Ok, I was just wondering if 255 was going to feel weird and try to follow the road. I'm going with a 245 plus a 5mm spacer.

Lol no.. Id go without 5mm spacer. Also, you dont look like a pro driver. Either 245 or 255 wont make any diff for u. The only thing that bothers u is ur brain.

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245/40/18's on 18x9.5, it's not exactly stretched, but it's not perfectly square, also depends on tire brand.

https://scontent-b-ord.xx.fbcdn.net/...42528349_o.jpg

Sweet looking set up!

Did you need to add some additional negative camber in the front to eliminate any weird poke?

My 255 Continental DWS looks like that 245, so brand matters

It is poking in the front

I do see that, a bit. I test fit my 18x9.5s on stock ride height and it looked a bit extreme in the poke region.

I'm in a mental coilover debate, and trying to see if once it's lowered, that added camber is enough, or if I need to specifically add MORE camber with plates / bolts in the front.


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I did camber it in up front to the max the coilover slot had. It barely pokes out. Top of the tires is still under the fender.

Thanks man! That helps. So, in the event of getting adjustable top hats, it basically goes towards its negative most setting?

Ok, I am down to 3 wheels and i can't decide which one I like better. If you would list your opinions please.

These wheels will be on a WRB BRZ and they will be chrome when I order them

1.) Rota Torque



http://img.photobucket.com/albums/v6...i45/side22.jpg


2.) Rota Grid

http://i939.photobucket.com/albums/a...s/P1030859.jpg


3. Enkai RPF1 SBC

Bump

I'm running 245/40-18's on 9.5. Best thing for me is that it made the digital speedo accurate finally.

Here is a 245/45 on a 17x8. I think 245 on a 9.5 isn't wide enough, but I'm always a fan of a tire meeting the edge of the wheel.

https://lh3.googleusercontent.com/-d...o/IMG_3196.JPG

https://lh4.googleusercontent.com/-i...o/IMG_3194.JPG

Also of note: Im running an E85 Stg 2 NA tune with an intake and the 245 DII's are just the right amount of grip. I can stick or break free depending on how I feel like driving. With a SC kit a 245 wouldn't be enough tire IMO.

Ok I changed my mind again I'm going with a staggered setup.

What is an ideal wheel width for a 235 tire and I'm assuming a 9.5 wheel for the rear?
@CSG Mike

There is no "ideal" wheel width. A 235mm tire should be about 9.25 inches wide. If you want some stretch then go with a 9. If you want more stretch go with a 9.5. Generally I like to stay within the tire manufcaturers rim width recommendation so decide on a tire and go to their website or Tire Rack. If you want stretch go with the largest they advise and if you want meaty, then go with the smallest.

Sorry, I can't recommend ANY Rota wheel.

I ran a 235 f on an 8.5 and a 255 r on a 9.5, Hankook V12. Now I'm square and I'd recommend you re-think your position unless you are putting down 400whp+

To add: if I hadn' ave gone square I would have tried to put a 245 on the 8.5. The balance will be off. I ran quite a bit of front camber and it still was under-steering. I'm not a great drivier. If you are then maybe you will make up for it, but I still think you will enjoy the car immensely better with a square setup.

If you are hell bent on some 235's I'm selling mine. Once you go square, you wont go back...