225/45/17 or 235/45/17 For 8inch wheel - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BRRRZZZ · 04-08-2018, 11:25 PM

Wondering which you guys would prefer on a 8 inch wheel. Looking at the firestone Indy 500.

Would you highly recommend against stretching the factory 215/45/17 on them?

FirstWinter · 04-09-2018, 01:39 AM

225/45/17. I would not advise 215/45 on an 8" wheel.

Mr.ac · 04-09-2018, 03:27 AM

The 235/45/17 would be a bit taller. It might throw your speedo off a bit. Go with a 235/40/17 if you want the 235's.
Or go with the 225/45/17. Which ever you want.

I do not recommend stretching out that 215 on 8" wheel. It looks super weak. Unless you love the hellaflush/stance look.

Tire choices, depends what you want out of them. Although I encourage anyone to avoid MPSS if you can't get them for under $130. Price vs performance compared to others it's not worth it.
I highly recommend you use the comparison tool for the price and performance on any tire.

TRAKRAVN · 04-09-2018, 05:17 AM

I use 215/45-17 RE71R’s on a 17x8 wheels. I haven’t had any issues over the years at the track. I have been through about 3 sets of tires on the same setup. The tire is rated for a 7-8” wheel so I don’t see the issue with it. Run the 215/45-17 save some money and enjoy the steering response.

yelsew · 04-09-2018, 08:01 AM

I know specifically the Indy 500 runs a little thin to begin with. The tread width on my 245/40r17 is a touch over 8" wide. You can see pictures of them mounted in my thread, link is in my sig. they are not pinched on my 17x8 wheels and sit fairly square. Unfortunately I do not believe the Indy 500 comes in 235/40 which I would have recommend, unless they have done size expansions recently. 225/45 my sit slightly stretched, but should keep the sidewalls stiffer and should drive pretty well, as long as the slight stretch doesn't bother you.

Jordanwolf · 04-09-2018, 11:25 AM

Not really sure about the recommendations against 215/45/17 on an 8 inch. They look absolutely fine, not stretched, and are a size documented to be under normal functionality.

Page 4 has an example of 215/45/17 on 8".

http://www.ft86club.com/forums/showt...=121927&page=4

Aluma007 · 04-09-2018, 09:05 PM

BFG comps in 215/45 have 8.1 inch tread width according to tirerack...I'd like to see that on an 8in wheel...probably look just like a 225/45 indy 500 which is 7.7 inches in width.

DarkSunrise · 04-09-2018, 10:46 PM

I've used the following:

8"
- 215/45/17
- 225/45/17
- 235/40/17

9"
- 235/45/17

They're all fine. (215/45/17 on a 17x8 is actually within the recommended wheel width range, at least for the tire I was using). On the street I like 235/45/17 for the thicker sidewall, but it's a slight difference at best.

04-08-2018, 11:25 PM	#1
BRRRZZZ Member Join Date: Jan 2013 Drives: 2013 BRZ Location: Canada Posts: 28 Thanks: 6 Thanked 2 Times in 2 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	225/45/17 or 235/45/17 For 8inch wheel Wondering which you guys would prefer on a 8 inch wheel. Looking at the firestone Indy 500. Would you highly recommend against stretching the factory 215/45/17 on them?

04-09-2018, 03:27 AM	#3
Mr.ac [insert cool phrase here] Join Date: Aug 2015 Drives: BRZ Premium Location: Central Coast CA Posts: 2,368 Thanks: 709 Thanked 1,559 Times in 930 Posts Mentioned: 30 Post(s) Tagged: 0 Thread(s)	The 235/45/17 would be a bit taller. It might throw your speedo off a bit. Go with a 235/40/17 if you want the 235's. Or go with the 225/45/17. Which ever you want. I do not recommend stretching out that 215 on 8" wheel. It looks super weak. Unless you love the hellaflush/stance look. Tire choices, depends what you want out of them. Although I encourage anyone to avoid MPSS if you can't get them for under $130. Price vs performance compared to others it's not worth it. I highly recommend you use the comparison tool for the price and performance on any tire. __________________ New daily driver - Subaru BRZ Premium Weekend fun/track car - '91 MR2 Turbo Gen3 Old daily driver - '88 MR2 Supercharged

04-09-2018, 10:46 PM	#8
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)	I've used the following: 8" - 215/45/17 - 225/45/17 - 235/40/17 9" - 235/45/17 They're all fine. (215/45/17 on a 17x8 is actually within the recommended wheel width range, at least for the tire I was using). On the street I like 235/45/17 for the thicker sidewall, but it's a slight difference at best. __________________ "Never run out of real estate, traction, and ideas at the same time." 2022 BRZ Build 2013 FR-S Build

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04-09-2018, 01:39 AM	#2
FirstWinter Senior Member Join Date: Nov 2015 Drives: Car Location: Location Posts: 646 Thanks: 374 Thanked 422 Times in 254 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	225/45/17. I would not advise 215/45 on an 8" wheel.

04-09-2018, 05:17 AM	#4
TRAKRAVN Senior Member Join Date: May 2015 Drives: 2015 Scion FRS - Raven Location: Brampton Posts: 141 Thanks: 107 Thanked 78 Times in 48 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I use 215/45-17 RE71R’s on a 17x8 wheels. I haven’t had any issues over the years at the track. I have been through about 3 sets of tires on the same setup. The tire is rated for a 7-8” wheel so I don’t see the issue with it. Run the 215/45-17 save some money and enjoy the steering response.

04-09-2018, 09:05 PM	#7
Aluma007 Senior Member Join Date: Sep 2016 Drives: 2017 Brz Location: TX Posts: 305 Thanks: 105 Thanked 78 Times in 64 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	BFG comps in 215/45 have 8.1 inch tread width according to tirerack...I'd like to see that on an 8in wheel...probably look just like a 225/45 indy 500 which is 7.7 inches in width.

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