Tire fitment issues in the rear - Page 21 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

timurrrr · 01-22-2022, 10:10 PM

et51!

Kona61 · 01-22-2022, 11:41 PM

Quote:

Originally Posted by 86man

Don't worry guys.

Japan will have a lot of new forged wheels size for the GR96/BRZ this year

For example, Advan will release a Racing GT Beyond version in 18 x 9J ET51. That means you can run wider tyres in the rear without having to cut up anything

http://www.yokohamawheel.jp/brand/ad...pn_beyond.html

I’m curious when they’ll actually arrive, though. Most wheel companies I’ve spoken to don’t have anything incoming to the US until Spring/Summer.

OkieSnuffBox · 01-23-2022, 12:47 AM

Has anyone taken pics of exactly what they have had to do to the inside of the rear fenders for the 18x9.5_255/35 setup to work?

I know "cut the fenders." But I'm curious to see exactly what the few have done to make it work.

Dylans47 · 01-23-2022, 02:47 AM

Am I overthinking it to say needing to compromise and go for an 18x9 is silly? The previous gen ran 18x9.5s well. Would that loss of 0.5" matter at all on track?

We got horsepower and lost wheel width.

Kona61 · 01-23-2022, 10:05 AM

Quote:

Originally Posted by OkieSnuffBox

Has anyone taken pics of exactly what they have had to do to the inside of the rear fenders for the 18x9.5_255/35 setup to work?

I know "cut the fenders." But I'm curious to see exactly what the few have done to make it work.

I’ll take some pics when mine is done.

ozafar · 01-23-2022, 01:13 PM

Okay, so I plugged in some numbers in WheelItFit. Obviously the wheel to vehicle isn’t accurate anymore, but comparing two wheels still works.

We know the following 17x9 setup works well (Thanks Tr4ck_day!!)
17x9 et42 245/40/17 on coilovers with 2.5 camber and 1.5 drop compared to:
18x9.5 et45 255/35/18 on coilovers with 2.5 camber and 1.5 drop with these differences:

18x9.5 setup has 3mm more poke
18x9.5 setup has 4mm smaller fender gap
18x9.5 setup is 10mm closer to strut
18x9.5 setup is 8mm larger overall diameter (1.28% difference)

@Tr4ck_day can you help confirm if the following differences would cause problems?

Thank you

Powersfrs · 01-23-2022, 01:17 PM

Quote:

Originally Posted by OkieSnuffBox

Has anyone taken pics of exactly what they have had to do to the inside of the rear fenders for the 18x9.5_255/35 setup to work?

I know "cut the fenders." But I'm curious to see exactly what the few have done to make it work.

I have these specs on a +45 Rim with no rubbing.

ozafar · 01-23-2022, 01:50 PM

Quote:

Originally Posted by Powersfrs

I have these specs on a +45 Rim with no rubbing.

So just to confirm. You’re running 18x9.5 et45 255/35/18 on coilovers without any issues?

Powersfrs · 01-23-2022, 02:43 PM

Quote:

Originally Posted by ozafar

So just to confirm. You’re running 18x9.5 et45 255/35/18 on coilovers without any issues?

pic sharing

Correct
They increased the rear end track by a few mm. Thats why folks with 18 9.5 +35 are having issues. The front end seems to be the same as before so a +35 fits up front and a +45 is what to get in the rear.( I’m running PS4S which tend to run wider than most tires)
Again At my height with 2.2 camber all around I have no issues. I’m running whiteline rear control arms. Kw V3 all around and vorshlog top hats up front. I’m also running a bit of toe in all around (just a tad)

ozafar · 01-23-2022, 04:04 PM

Thanks for the pic! Looks great. Do you have the rear control arms to control the rear camber? Do you know what the rear camber would be if you hadn’t changed the rcas?

Powersfrs · 01-23-2022, 05:05 PM

Quote:

Originally Posted by ozafar

Thanks for the pic! Looks great. Do you have the rear control arms to control the rear camber? Do you know what the rear camber would be if you hadn’t changed the rcas?

Without the control arms you have no adjustability for camber. On my 2013 Scion FR-S without control arms one side had about -3 degrees of camber and the other side had -2.6. Without control arms you will most likely rub. Ride height will sort of dictate your camber without the arms.

ozafar · 01-23-2022, 05:11 PM

Also more angles please!

Powersfrs · 01-23-2022, 07:24 PM

Quote:

Originally Posted by ozafar

Also more angles please!

Ok I’ll take more pics tomorrow

Simmons · 01-23-2022, 09:18 PM

Quote:

Originally Posted by Powersfrs

Without the control arms you have no adjustability for camber. On my 2013 Scion FR-S without control arms one side had about -3 degrees of camber and the other side had -2.6. Without control arms you will most likely rub. Ride height will sort of dictate your camber without the arms.

You are thinking wrong. the more camber means less chance of rubbing.

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01-22-2022, 10:10 PM	#281
timurrrr Senior Member Join Date: May 2019 Drives: 2022 GR86 Location: Between Sonoma and Laguna Seca Posts: 1,707 Thanks: 2,129 Thanked 1,297 Times in 718 Posts Mentioned: 30 Post(s) Tagged: 1 Thread(s)	et51!

01-23-2022, 12:47 AM	#283
OkieSnuffBox Senior Member Join Date: Aug 2014 Drives: '23 BRZ Limited Location: OKC, OK Posts: 1,986 Thanks: 660 Thanked 1,230 Times in 703 Posts Mentioned: 9 Post(s) Tagged: 1 Thread(s)	Has anyone taken pics of exactly what they have had to do to the inside of the rear fenders for the 18x9.5_255/35 setup to work? I know "cut the fenders." But I'm curious to see exactly what the few have done to make it work.

01-23-2022, 02:47 AM	#284
Dylans47 Senior Member Join Date: Nov 2017 Drives: Scion FR-S Location: California Posts: 176 Thanks: 49 Thanked 41 Times in 24 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Am I overthinking it to say needing to compromise and go for an 18x9 is silly? The previous gen ran 18x9.5s well. Would that loss of 0.5" matter at all on track? We got horsepower and lost wheel width.

01-23-2022, 01:13 PM	#286
ozafar Senior Member Join Date: Feb 2017 Drives: 2015 Scion FRS Release Series 1.0 Location: Michigan Posts: 167 Thanks: 2 Thanked 45 Times in 25 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Okay, so I plugged in some numbers in WheelItFit. Obviously the wheel to vehicle isn’t accurate anymore, but comparing two wheels still works. We know the following 17x9 setup works well (Thanks Tr4ck_day!!) 17x9 et42 245/40/17 on coilovers with 2.5 camber and 1.5 drop compared to: 18x9.5 et45 255/35/18 on coilovers with 2.5 camber and 1.5 drop with these differences: 18x9.5 setup has 3mm more poke 18x9.5 setup has 4mm smaller fender gap 18x9.5 setup is 10mm closer to strut 18x9.5 setup is 8mm larger overall diameter (1.28% difference) @Tr4ck_day can you help confirm if the following differences would cause problems? Thank you

01-23-2022, 04:04 PM	#290
ozafar Senior Member Join Date: Feb 2017 Drives: 2015 Scion FRS Release Series 1.0 Location: Michigan Posts: 167 Thanks: 2 Thanked 45 Times in 25 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks for the pic! Looks great. Do you have the rear control arms to control the rear camber? Do you know what the rear camber would be if you hadn’t changed the rcas?

01-23-2022, 05:11 PM	#292
ozafar Senior Member Join Date: Feb 2017 Drives: 2015 Scion FRS Release Series 1.0 Location: Michigan Posts: 167 Thanks: 2 Thanked 45 Times in 25 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Also more angles please!

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