245 square setup... Need advice - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

cjsporl1996 · 03-26-2014, 08:58 PM

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.

djdnz · 03-26-2014, 09:14 PM

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

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

rainmonkey · 03-26-2014, 09:18 PM

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

adprokid · 03-26-2014, 09:21 PM

245 is good for 9.0 or 8.5

cjsporl1996 · 03-26-2014, 10:05 PM

So 245 front with 255 in the rear?

Xerious · 03-26-2014, 10:14 PM

Quote:

Originally Posted by djdnz

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

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

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.

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cjsporl1996 · 03-26-2014, 10:31 PM

Quote:

Originally Posted by Xerious

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?

Figo · 03-26-2014, 10:33 PM

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.

mav1178 · 03-26-2014, 10:34 PM

Quote:

Originally Posted by rainmonkey

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

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

-alex

midnight23 · 03-27-2014, 02:04 AM

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..

dradernh · 03-27-2014, 10:46 AM

Quote:

Originally Posted by cjsporl1996

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.

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.

cjsporl1996 · 03-27-2014, 03:01 PM

Quote:

Originally Posted by dradernh

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?

dradernh · 03-27-2014, 06:19 PM

Quote:

Originally Posted by cjsporl1996

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.

cjsporl1996 · 03-27-2014, 07:39 PM

Quote:

Originally Posted by dradernh

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.

03-26-2014, 08:58 PM	#1
cjsporl1996 Banned Join Date: Nov 2013 Drives: WRB BRZ, Monte Carlo SS Location: Cape May, NJ Posts: 438 Thanks: 85 Thanked 75 Times in 57 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	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.

03-26-2014, 10:33 PM	#8
Figo Senior Member Join Date: Jun 2013 Drives: Vortech Supercharged FR-S Location: Central Jersey Posts: 1,515 Thanks: 597 Thanked 934 Times in 428 Posts Mentioned: 17 Post(s) Tagged: 1 Thread(s)	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. __________________ I'd rather lose by a mile because I built my own car, than win by an inch because someone else built it for me. Your car is your story, so don't let someone else write the book. ( White Tiger ) - FiGo's 車誌.

03-27-2014, 02:04 AM	#10
midnight23 dying bird under the hood Join Date: Mar 2013 Drives: 2013 SWP Limited BRZ Location: Disneyland, California Posts: 1,331 Thanks: 546 Thanked 451 Times in 295 Posts Mentioned: 34 Post(s) Tagged: 0 Thread(s)	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.. __________________ GReddy Turbo BRZ tuned by Evasive Motorsports Build Thread Instagram

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03-26-2014, 09:14 PM	#2
djdnz 1337 Join Date: Oct 2011 Drives: 2013 BRZ WRB S/C Location: San Jose, CA / Waterloo, ON Posts: 1,134 Thanks: 776 Thanked 482 Times in 269 Posts Mentioned: 7 Post(s) Tagged: 2 Thread(s)	255/35/18 at least. 245 is stretched on a 9.5. If you want traction, 255 or 265 is what you want.

03-26-2014, 09:18 PM	#3
rainmonkey Senior Member Join Date: Aug 2012 Drives: BRZ - Dark Grey Location: MA Posts: 298 Thanks: 7 Thanked 35 Times in 24 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	don't you already have a similar thread running? I believe CSG Mike is helping out plenty there...

03-26-2014, 09:21 PM	#4
adprokid Senior Member Join Date: Dec 2010 Drives: ZN6 / GDB-G Location: Far Posts: 589 Thanks: 710 Thanked 263 Times in 133 Posts Mentioned: 0 Post(s) Tagged: 1 Thread(s)	245 is good for 9.0 or 8.5

03-26-2014, 10:05 PM	#5
cjsporl1996 Banned Join Date: Nov 2013 Drives: WRB BRZ, Monte Carlo SS Location: Cape May, NJ Posts: 438 Thanks: 85 Thanked 75 Times in 57 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	So 245 front with 255 in the rear?

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