17x7.5 or 17x8? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

yoshiharadesign · 07-08-2013, 02:22 PM

We are currently investigating building the d-12c in either a 17x7.5 or 17x8.0 application. Would like to see which would be the size with consideration for scca autocross? Thanks for everyones input.

RehabJeff86 · 07-08-2013, 04:05 PM

17x7.5 +20

Gary in NJ · 07-08-2013, 05:40 PM

Personally, to keep a 17" D12C as light as possible (15-16 pound range) I'd prefer 17x7.5. If/when I do decide to go FI I would be looking to put 245/40's on the rear and I do believe that these would fit on a 7.5. Also, I would like to get a wheel with a +35 to +38 offset.

Oh, I'd like them as soon as possible please

Seriously, if you decide to pet these in production I'm all in.

yoshiharadesign · 07-09-2013, 02:52 PM

wow. Actually 17x8 is pulling away from the 17x7.5... interesting!

f0rge · 07-09-2013, 03:01 PM

for autocross wouldn't most people want 17x9 since 9inch is the max allowed for RWD STX?

RFP1's in 17x9 are hugely popular for that very reason.

rikdrt1 · 07-10-2013, 02:45 AM

I heard somewhere the closer to stock the better it handles.... my friend put 8's on and he wish he hadn't the suspension is choppier and heaver when carving the canyons.

I guess it depends what you are looking for.
I was looking for changing it out as cheaply as possible so just a thought..

Gary in NJ · 07-10-2013, 11:18 AM

Quote:

Originally Posted by rikdrt1

I heard somewhere the closer to stock the better it handles.... my friend put 8's on and he wish he hadn't the suspension is choppier and heaver when carving the canyons.

Weight would have a greater effect on handling then a 1/2 inch greater rim width. Of course, all else being equal, an 8-inch rim will always weight more then a 7.5 inch rim of the same design.

hmong337 · 07-10-2013, 11:34 AM

17x9... no?

DarkSunrise · 07-10-2013, 11:37 AM

Quote:

Originally Posted by rikdrt1

I heard somewhere the closer to stock the better it handles.... my friend put 8's on and he wish he hadn't the suspension is choppier and heaver when carving the canyons.

I guess it depends what you are looking for.
I was looking for changing it out as cheaply as possible so just a thought..

There's got to be more to it than that, IMO. Possibly:

1) Increased weight (as mentioned above)
2) Increased wheel diameter
3) Increased wheel offset
4) Increased tire width
5) Different tire compound

Or any combination of the above.

wparsons · 07-10-2013, 12:17 PM

I have 17x8's (+45) with 225/45 Z2's and it drives like stock daily, and has WAY more grip when pushed. The only time it feels different than stock at low speeds is in bad pavement, it tramlines worse.

If it feels drastically worse than stock with 17x8's it's either in their head, the offset is wonky or they went with heavy wheels/tires and it feels clunky.

yoshiharadesign · 07-10-2013, 03:16 PM

I think probably 17x8 is looking to be a fairly clear winner here..

Kido1986 · 07-10-2013, 03:18 PM

If it's for autocross the only two sizes that matter are 17x7 (+42-54 offset only) or 17x9, any offset.

Anyone buying special wheels for autocross wants a Stock illegal and STX uncompetitive wheel. Build us a light 17x7 +42 that isn't ugly (looking at you, Convex RPF1!) and you'll sell to us in droves

yoshiharadesign · 07-10-2013, 04:45 PM

Quote:

Originally Posted by Kido1986

If it's for autocross the only two sizes that matter are 17x7 (+42-54 offset only) or 17x9, any offset.

Anyone buying special wheels for autocross wants a Stock illegal and STX uncompetitive wheel. Build us a light 17x7 +42 that isn't ugly (looking at you, Convex RPF1!) and you'll sell to us in droves

That is interesting to know and we really appreciate the assistance. We would be considering all 3 sizes

rcm47 · 07-10-2013, 05:31 PM

17x9 in all styles!

View Poll Results: which size wheels would you choose?
17x7.5	15	25.42%
17x8.0	44	74.58%
Voters: 59. You may not vote on this poll

07-08-2013, 02:22 PM	#1
yoshiharadesign Banned Join Date: Jun 2012 Drives: BRZ Location: california Posts: 297 Thanks: 172 Thanked 159 Times in 88 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	17x7.5 or 17x8? We are currently investigating building the d-12c in either a 17x7.5 or 17x8.0 application. Would like to see which would be the size with consideration for scca autocross? Thanks for everyones input.

07-08-2013, 04:05 PM	#2
RehabJeff86 Senior Member Join Date: Mar 2013 Drives: 2013 WhiteOut FR-S Location: Dublin,CA Posts: 969 Thanks: 899 Thanked 492 Times in 306 Posts Mentioned: 67 Post(s) Tagged: 2 Thread(s)	17x7.5 +20 __________________ 2013 Scion FR-S whiteout 2012 Porsche Panamera S carbon grey 2008 Range Rover Sport SS black - sold 2004 BMW M3 alpine wies - sold

07-08-2013, 05:40 PM	#3
Gary in NJ Senior Member Join Date: Feb 2013 Drives: WR Blue BRZ, 240Z Location: Amongst the twisty roads Posts: 587 Thanks: 21 Thanked 412 Times in 206 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Personally, to keep a 17" D12C as light as possible (15-16 pound range) I'd prefer 17x7.5. If/when I do decide to go FI I would be looking to put 245/40's on the rear and I do believe that these would fit on a 7.5. Also, I would like to get a wheel with a +35 to +38 offset. Oh, I'd like them as soon as possible please Seriously, if you decide to pet these in production I'm all in. __________________ Phantom ESC, ECUtek Tune, Nameless Front Pipe & Axle Back, Enkei RS+M 17x8 et35, OEM+Ref

07-10-2013, 11:34 AM	#8
hmong337 Emperor JDM Join Date: Jun 2013 Drives: '91 MR2 Gen3 3SGTE, '13 FRS Location: Onterrible, Canada Posts: 1,750 Thanks: 3,498 Thanked 909 Times in 495 Posts Mentioned: 20 Post(s) Tagged: 3 Thread(s)	17x9... no? __________________

07-09-2013, 02:52 PM	#4
yoshiharadesign Banned Join Date: Jun 2012 Drives: BRZ Location: california Posts: 297 Thanks: 172 Thanked 159 Times in 88 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	wow. Actually 17x8 is pulling away from the 17x7.5... interesting!

07-10-2013, 03:16 PM	#11
yoshiharadesign Banned Join Date: Jun 2012 Drives: BRZ Location: california Posts: 297 Thanks: 172 Thanked 159 Times in 88 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I think probably 17x8 is looking to be a fairly clear winner here..

07-10-2013, 05:31 PM	#14
rcm47 Senior Member Join Date: Oct 2010 Drives: 13’ FRS (traded), 18’ CWP BRZ tS Location: California Posts: 605 Thanks: 589 Thanked 300 Times in 147 Posts Mentioned: 3 Post(s) Tagged: 1 Thread(s)	17x9 in all styles!

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