Optimal Wheel Size for Stock Power - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Spartan65 · 08-26-2012, 08:53 PM

Quote:

Originally Posted by D1cker

The problem with this is that almost no one makes a 235/35/18. 245/35/18 will be a lot more readily available or 225/40/18

BFGoodrich g-Force T/A KDW 2 235/35-19 XL Tire $175.00 Tire Rack

twinturba · 08-26-2012, 09:16 PM

It is safe to assume that Toyota and Subaru spent considerable time and money coming up with this answer.

JimmyMac · 08-26-2012, 09:16 PM

I think the key word is almost. There aren't any tires I would choose from the list in that size on Tirerack.

Tanuki · 08-26-2012, 09:44 PM

Quote:

Originally Posted by twinturba

It is safe to assume that Toyota and Subaru spent considerable time and money coming up with this answer.

No. They did what would be the least expensive for them while yielding the best all around wheel they could. BMW is about the best sub 100k car company for wheel fitment and factory options imo.

Like this:

Tanuki · 08-26-2012, 10:07 PM

Well the wheels I am thinking of getting are 17x8 +44. I hope they fall right into that performance range. I believe they are around 14lbs per wheel as well.

JimmyMac · 08-26-2012, 10:14 PM

Nice!

switchlanez · 08-26-2012, 10:49 PM

I replied to your post on the fb page but I'll post this here for the sake of discussion:

TRD makes two wheels for this car both sized at 18x7.5 +46 and the recommended tires are 225/40-18 MICHELIN Pilot Super Sport.

The STI Concept has 18x7.5 +48 at each corner with Dunlop Direzza ZII, 215/45R18 at the front, and slightly wider 225/45R18 at the rear. The consumer version of the STI wheels are 17x7.5 +48. Best tire match is 225/45-17.

Toyota had a few demo cars marketing 18" BBS wheels on 215 tires (not sure on the rest of the specs).

Lastly, Team86 tuned this car for 4 months on the Nurburgring using 17x7 +48 STI/Enkei wheels from the Forester. I suspect the tire size was 215/45-17.

And you've seen the R&T video where they proved the stock 215/45-17 dimensions on better compound performed better than 235/40-18 on the same compound. Also, be mindful of the effect of weight when you increase wheel/tire width. The rule is 1.7 lbs net saving (0.7 lbs rotational) for each 1 lb saved in the wheel/tire combo assuming you maintain the same overall diameter. It's questionable whether the added rotational mass of 235+ wide tires is worth the added grip. Try to aim for lighter than stock because power on this car is scarce. Nobody knows this car better than Subaru/Toyota so I'd stick to their sizes specified above. 17" for thicker sidewall (more comfort) or 18" for flatter contact patch (more grip), 225 width for balanced grip/aesthetics.

Tanuki · 08-26-2012, 10:57 PM

Great, Thank you!

SLEEPER WRX · 08-26-2012, 11:31 PM

I put on 17 x 8 +48 with 235 40 17's
It's working out real well, great looks and improved performance

D1cker · 08-26-2012, 11:44 PM

Quote:

Originally Posted by Spartan65

Falken makes the Ziex, probably the least expensive.
FALKEN ZIEX 912 ALL SEASON 235/35R18 140-165$ per
and the
BFGoodrich g-Force T/A KDW-2 approx 180-195 per

Those are both crap tires and awfully expensive for what they are.

D1cker · 08-26-2012, 11:45 PM

Quote:

Originally Posted by Spartan65

Seriously a smidge?, you sound like the guys that tried to sell tires with me when I was at DTC. I retired (sorry about the pun) from DTC, three words " I know Tires"

http://www.miata.net/garage/tirecalc.html

0.9% is a pretty damn small margin so yes, a smidge. at 100 mph his speedo will be reading 101.

D1cker · 08-26-2012, 11:46 PM

Quote:

Originally Posted by Tanuki

Well the wheels I am thinking of getting are 17x8 +44. I hope they fall right into that performance range. I believe they are around 14lbs per wheel as well.

Those will fit very well, run a 235/40/17 for the best performance with those.

Tanuki · 08-26-2012, 11:57 PM

What tires do you guys prefer? Affordable but good

twinturba · 08-26-2012, 11:58 PM

Quote:

Originally Posted by Tanuki

No. They did what would be the least expensive for them while yielding the best all around wheel they could. BMW is about the best sub 100k car company for wheel fitment and factory options imo.

Like this:

"Least expensive and best all around" -sounds like a winner.

Check post #35 for more Toyota/Subaru options

Xxxxxx is the best sub xxxk car company for wheel fitment and factory options imo, but has nothing to do with a car that is sub 30k

BTW you have some nice looking wheels

View Poll Results: Best wheel size for stock power?
17x8	173	36.58%
17x8.5	29	6.13%
17x9	80	16.91%
18x8.5	37	7.82%
18x9	21	4.44%
18x9.5	22	4.65%
Staggered (please list sizes below)	14	2.96%
Other- I am interested to know.	97	20.51%
Voters: 473. You may not vote on this poll

08-26-2012, 09:16 PM	#30
twinturba Member Join Date: Jul 2012 Drives: 86 Location: SF, CA Posts: 31 Thanks: 6 Thanked 5 Times in 5 Posts Mentioned: 0 Post(s)	It is safe to assume that Toyota and Subaru spent considerable time and money coming up with this answer. __________________ Current:'15 Prius V, '14 GLK bluetec, '04 Taco, '00 E320, '51 Merc Past:''13 FR-S, '06 SLK55, '01 M5, '11 ML Bluetec, '06 S500, '05 Elise, '98 Gs400 Spectra Blue, '94 Supra TT, '89 5.0 GT, '87 ASC Mclaren, '87 5.0 GT, '84 conv 5.0 LX, '70 Coronet 440 Bayareatwostroke

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08-26-2012, 09:16 PM	#31
JimmyMac Senior Member Join Date: Aug 2012 Drives: 2013 FR-S, 2016 Miata Club Location: NC Posts: 785 Thanks: 183 Thanked 258 Times in 171 Posts Mentioned: 7 Post(s)	I think the key word is almost. There aren't any tires I would choose from the list in that size on Tirerack.

08-26-2012, 10:07 PM	#33
Tanuki Turtle Factory Join Date: Oct 2009 Drives: Mint M3 Location: PDX Posts: 1,286 Thanks: 1,021 Thanked 614 Times in 312 Posts Mentioned: 9 Post(s)	Well the wheels I am thinking of getting are 17x8 +44. I hope they fall right into that performance range. I believe they are around 14lbs per wheel as well.

08-26-2012, 10:14 PM	#34
JimmyMac Senior Member Join Date: Aug 2012 Drives: 2013 FR-S, 2016 Miata Club Location: NC Posts: 785 Thanks: 183 Thanked 258 Times in 171 Posts Mentioned: 7 Post(s)	Nice!

08-26-2012, 10:49 PM	#35
switchlanez Glorious BRZ Master Race Join Date: Apr 2011 Drives: Subaru Libird Location: Race Wars Posts: 3,645 Thanks: 1,050 Thanked 2,719 Times in 1,079 Posts Mentioned: 110 Post(s)	I replied to your post on the fb page but I'll post this here for the sake of discussion: TRD makes two wheels for this car both sized at 18x7.5 +46 and the recommended tires are 225/40-18 MICHELIN Pilot Super Sport. The STI Concept has 18x7.5 +48 at each corner with Dunlop Direzza ZII, 215/45R18 at the front, and slightly wider 225/45R18 at the rear. The consumer version of the STI wheels are 17x7.5 +48. Best tire match is 225/45-17. Toyota had a few demo cars marketing 18" BBS wheels on 215 tires (not sure on the rest of the specs). Lastly, Team86 tuned this car for 4 months on the Nurburgring using 17x7 +48 STI/Enkei wheels from the Forester. I suspect the tire size was 215/45-17. And you've seen the R&T video where they proved the stock 215/45-17 dimensions on better compound performed better than 235/40-18 on the same compound. Also, be mindful of the effect of weight when you increase wheel/tire width. The rule is 1.7 lbs net saving (0.7 lbs rotational) for each 1 lb saved in the wheel/tire combo assuming you maintain the same overall diameter. It's questionable whether the added rotational mass of 235+ wide tires is worth the added grip. Try to aim for lighter than stock because power on this car is scarce. Nobody knows this car better than Subaru/Toyota so I'd stick to their sizes specified above. 17" for thicker sidewall (more comfort) or 18" for flatter contact patch (more grip), 225 width for balanced grip/aesthetics. __________________ << BUILD THREAD >>

08-26-2012, 10:57 PM	#36
Tanuki Turtle Factory Join Date: Oct 2009 Drives: Mint M3 Location: PDX Posts: 1,286 Thanks: 1,021 Thanked 614 Times in 312 Posts Mentioned: 9 Post(s)	Great, Thank you!

08-26-2012, 11:31 PM	#37
SLEEPER WRX Senior Member Join Date: Aug 2012 Drives: 2013 BRZ Location: San Jose Posts: 193 Thanks: 2 Thanked 134 Times in 72 Posts Mentioned: 7 Post(s)	I put on 17 x 8 +48 with 235 40 17's It's working out real well, great looks and improved performance

08-26-2012, 11:57 PM	#41
Tanuki Turtle Factory Join Date: Oct 2009 Drives: Mint M3 Location: PDX Posts: 1,286 Thanks: 1,021 Thanked 614 Times in 312 Posts Mentioned: 9 Post(s)	What tires do you guys prefer? Affordable but good

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