17x9 vs 17x8 vs 18x8 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

wizzo · 10-20-2014, 05:23 PM

Hey all,

Shopping for wheels and tires, before i start i should mention that my gt86 is my DD and track day toy.. so far ive completed 2 track days and a few mountain runs on my new car, stock brakes and tires are done.. im going with a set of good pads and lines before upgrading to apracing sprint kit. As for tires and wheels, im very confused because i keep reading more and more on these forums.

Ive narrowed it down to the fact that i dont think ill run a 245/255/265 for track days specially since im n/a and dont plan to supercharge or go F/I for the next 20000-25000 km. I would like to try out the hankook rs3. Wheel size is whats confusing me.. I'm partial to the look of 17's. What would a 225/45r17 be like on a 17x9.. if it would not be too stretched i would pick that option because in the future with more power a 245 might suite my needs.. for any of you supercharged guys, are good 225's enough grip on a 140ish treadwear tire?

Anyway, what would you guys suggest go with a 225/45 on a 17x9 and have space for a wider tire in the future? Run a 17x8 or 18x8 because even with a supercharger for trackdays a 225 is enough? Does the stretch on a 17x9 possibly benefit the driver?

vroom4 · 10-20-2014, 05:27 PM

just start with a 245/40 RS3 on a 17x9 et35-45. 225 on a 9" wheel is silly.

gramicci101 · 10-20-2014, 05:28 PM

A 225 on a 17x9 would be very stretched. Put it on a 17x8 instead. If you decide to go with 17x9, get 245's.

As far as 18's, 17's clear the sprint kit just fine. 18's are just added weight.

themajesticone · 10-20-2014, 05:35 PM

To avoid stretching the tire too much I would go 235s on a 9" wide wheel at a minimum but 245/255s would be more proper.

On an 8" wide wheel you can essentially go 215/225 (expect some stretch) but 235/245 would be more proper in that sense as well.

tigermack · 10-20-2014, 05:37 PM

Barely any stretch with 235/40 on a 9". 225/45 would be fine.

DarkSunrise · 10-20-2014, 05:40 PM

17x8 is a good size for track days with NA cars. Fits anything from 215-235 width.

If you're pretty sure you'll run a 245 in the future, then go with an 8.5" or 9".

G-Man · 10-20-2014, 05:42 PM

a 17x8 can hold most(all?) 245/40 if you want to move up later on. the only benefit of 17x9 is the bigger concave look if you are into that and the potential to get into really big tires.

tigermack · 10-20-2014, 05:49 PM

Quote:

Originally Posted by G-Man

a 17x8 can hold most(all?) 245/40 if you want to move up later on. the only benefit of 17x9 is the bigger concave look if you are into that and the potential to get into really big tires.

stiffer sidewalls... better response.

asdf · 10-20-2014, 05:58 PM

Quote:

Originally Posted by tigermack

Barely any stretch with 235/40 on a 9". 225/45 would be fine.

that tire sizing looks really good!

wizzo · 10-20-2014, 06:00 PM

Thanks for the quick responses. I dont want to run 245 while n/a 225/45 on a 17x9 might be the decider.. 17x8 will work fine though hahaha such a confusing decision. @csgmike @csgdavid

wparsons · 10-20-2014, 06:57 PM

245's will feel better on a 9" wheel than an 8", but you can definitely run 245's on an 8".

I have 225's on an 8" wheel, still LOTS of grip.

I wouldn't put 225's on a 9" wheel at all. If you've got a wheel that size, get 245's on it.

Leonardo · 10-20-2014, 07:04 PM

I've got 245 MPSS on 7.5's. I'm switching up to wider soon. I want 17x9 all around. My engine is stock and I can still spin them.

86Toyobaru · 10-21-2014, 05:21 AM

8J or 9J? Hard to decide?
Thats why I choose 8.5J for both my stock GT86(225 tire width) and stage 2 STi (245 tire width).

wizzo · 10-21-2014, 07:45 AM

Im set on rpf1, thats not an option

235/40R17 is a good option..

10-20-2014, 05:23 PM	#1
wizzo Member Join Date: Jun 2014 Drives: 2014 Toyota 86 Location: Dubai, UAE Posts: 84 Thanks: 2 Thanked 17 Times in 14 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	17x9 vs 17x8 vs 18x8 Hey all, Shopping for wheels and tires, before i start i should mention that my gt86 is my DD and track day toy.. so far ive completed 2 track days and a few mountain runs on my new car, stock brakes and tires are done.. im going with a set of good pads and lines before upgrading to apracing sprint kit. As for tires and wheels, im very confused because i keep reading more and more on these forums. Ive narrowed it down to the fact that i dont think ill run a 245/255/265 for track days specially since im n/a and dont plan to supercharge or go F/I for the next 20000-25000 km. I would like to try out the hankook rs3. Wheel size is whats confusing me.. I'm partial to the look of 17's. What would a 225/45r17 be like on a 17x9.. if it would not be too stretched i would pick that option because in the future with more power a 245 might suite my needs.. for any of you supercharged guys, are good 225's enough grip on a 140ish treadwear tire? Anyway, what would you guys suggest go with a 225/45 on a 17x9 and have space for a wider tire in the future? Run a 17x8 or 18x8 because even with a supercharger for trackdays a 225 is enough? Does the stretch on a 17x9 possibly benefit the driver?

10-20-2014, 05:35 PM	#4
themajesticone Senior Member Join Date: Jun 2014 Drives: '13 UM86 Location: Bay Area, California Posts: 406 Thanks: 338 Thanked 176 Times in 112 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	To avoid stretching the tire too much I would go 235s on a 9" wide wheel at a minimum but 245/255s would be more proper. On an 8" wide wheel you can essentially go 215/225 (expect some stretch) but 235/245 would be more proper in that sense as well. __________________ JRSC C30 91 oct \| JDL UEL Header \| Tomei Overpipe \| Milltek Front Pipe \| Milltek Catback \| SPL LCA v2 \| FA 500 v5 Coilovers 6k/7k \| SPC Front Camber Bolts \| Enkei RPF1 17x9 +35 \| 245/40 Michelin Pilot Super Sport

10-20-2014, 05:37 PM	#5
tigermack STX 188 Join Date: Mar 2014 Drives: STX BRZ Location: Bay Area, CA Posts: 881 Thanks: 830 Thanked 624 Times in 308 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Barely any stretch with 235/40 on a 9". 225/45 would be fine. __________________ STX BRZ #188 prev - #188 FSP MZ3 & STX e36 http://tigermack.zenfolio.com/p671136114

10-20-2014, 05:40 PM	#6
DarkSunrise Senior Member Join Date: Apr 2012 Drives: 22 BRZ (Previously 13 FR-S) Location: USA Posts: 5,798 Thanks: 2,187 Thanked 4,243 Times in 2,221 Posts Mentioned: 48 Post(s) Tagged: 2 Thread(s)	17x8 is a good size for track days with NA cars. Fits anything from 215-235 width. If you're pretty sure you'll run a 245 in the future, then go with an 8.5" or 9". __________________ "Never run out of real estate, traction, and ideas at the same time." 2022 BRZ Build 2013 FR-S Build

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10-20-2014, 05:27 PM	#2
vroom4 Join Date: Feb 2014 Drives: BRZ Location: East Posts: 820 Thanks: 18 Thanked 301 Times in 186 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	just start with a 245/40 RS3 on a 17x9 et35-45. 225 on a 9" wheel is silly.

10-20-2014, 05:28 PM	#3
gramicci101 Off Topic Join Date: Feb 2014 Drives: 2014 Subaru BRZ Limited Location: Vegas, baby! Posts: 4,610 Thanks: 2,369 Thanked 4,243 Times in 2,170 Posts Mentioned: 43 Post(s) Tagged: 3 Thread(s)	A 225 on a 17x9 would be very stretched. Put it on a 17x8 instead. If you decide to go with 17x9, get 245's. As far as 18's, 17's clear the sprint kit just fine. 18's are just added weight.

10-20-2014, 06:00 PM	#10
wizzo Member Join Date: Jun 2014 Drives: 2014 Toyota 86 Location: Dubai, UAE Posts: 84 Thanks: 2 Thanked 17 Times in 14 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Thanks for the quick responses. I dont want to run 245 while n/a 225/45 on a 17x9 might be the decider.. 17x8 will work fine though hahaha such a confusing decision. @csgmike @csgdavid

10-20-2014, 07:04 PM	#12
Leonardo Country Boy 4 Life Join Date: Jul 2012 Drives: 19' & 06' Ridgelines, 13' FR-S Location: EUGENE Posts: 5,228 Thanks: 6,719 Thanked 5,293 Times in 2,720 Posts Mentioned: 47 Post(s) Tagged: 1 Thread(s)	I've got 245 MPSS on 7.5's. I'm switching up to wider soon. I want 17x9 all around. My engine is stock and I can still spin them.

10-21-2014, 05:21 AM	#13
86Toyobaru Member Join Date: Jul 2013 Drives: 86 & GRB Location: Taiwan & Portland, OR Posts: 79 Thanks: 13 Thanked 35 Times in 19 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	8J or 9J? Hard to decide? Thats why I choose 8.5J for both my stock GT86(225 tire width) and stage 2 STi (245 tire width).

10-21-2014, 07:45 AM	#14
wizzo Member Join Date: Jun 2014 Drives: 2014 Toyota 86 Location: Dubai, UAE Posts: 84 Thanks: 2 Thanked 17 Times in 14 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Im set on rpf1, thats not an option 235/40R17 is a good option..

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