optimal street tire size for RTR on 17x7 - Page 8 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

des · 03-17-2013, 01:36 PM

Hoosiers can and should go bigger than you would with street tires -- they are cantilevered for just this reason. I don't know what CS folks are running, but I would suspect it's at least 245, if not 255.

(I've seen fast drivers squeeze a 275 onto a 6-inch rim, so a 255 on a 7 would not be extreme.)

On street tires 225s or 235s work, depending on the tire. Dunlops have stiff sidewalls, RS3s don't.

There are rules changes afoot as well; if you can wait a few weeks there may be some guidance on what tires Stock will be running next year.

Gearhd79 · 03-17-2013, 01:46 PM

im set...I've comitted to CS(RTR) this year and about to set up the suspention as per CS rules. I am trying to improve the car as my skills improve.

xwd · 03-17-2013, 02:34 PM

245/40/17 is the A6 size to use and it works fine on a 17x7 rim. You can get the BFG R1-S in 235/40/17 but to me it's too short and works against the car's crappy rev limiter. 255/45/17 is way too tall. I tried fitting the 275/40/17 A6 and it wouldn't fit in the front, hits the front spring perch.

I ordered a set of 225/45/17 Rivals to use to save the A6s and run RTR sometimes. I think they will work well. I know there were guys running 235 and 245 Star Specs on the stock rims with decent results, they have very stiff sidewalls for a street tire.

Simmons · 03-18-2013, 07:43 PM

So I got to drive two RTR Brz's yesterday. One is Completly stock with 225 Rivals, and the other had alignment, Strano bar, and Z1's. I really liked the way the car with rivals worked, in one run with a passenger I was only 2 seconds off my time in my STX Brz. The other car had too much understeer for my driving.

I really wish the Rivals were out in my size.

Simmons

Gearhd79 · 03-18-2013, 08:02 PM

right now im completely stock on ZII's and thinking of the strano bar with some really stiff endlinks and an alignment (crash bolts?)...BUT I want to see how the car is the way it is now before making too many changes

Aznsky · 03-18-2013, 11:06 PM

Quote:

Originally Posted by Simmons

So I got to drive two RTR Brz's yesterday. One is Completly stock with 225 Rivals, and the other had alignment, Strano bar, and Z1's. I really liked the way the car with rivals worked, in one run with a passenger I was only 2 seconds off my time in my STX Brz. The other car had too much understeer for my driving.

I really wish the Rivals were out in my size.

Simmons

Thanks for the comments! Another positive review on the Rivals. Just wondering if anybody has driven in rain/wet

renfield90 · 03-19-2013, 02:38 AM

Quote:

Originally Posted by des

Hoosiers can and should go bigger than you would with street tires -- they are cantilevered for just this reason. I don't know what CS folks are running, but I would suspect it's at least 245, if not 255.

(I've seen fast drivers squeeze a 275 onto a 6-inch rim, so a 255 on a 7 would not be extreme.)

On street tires 225s or 235s work, depending on the tire. Dunlops have stiff sidewalls, RS3s don't.

There are rules changes afoot as well; if you can wait a few weeks there may be some guidance on what tires Stock will be running next year.

Interesting. Are you on the SAC, or do you have insider knowledge from elsewhere?

I can throw in another good review for the Rivals. I got to drive a CS Solstice on a brand new set of these last month. They needed some scrubbing in to get working right but on day 2 we were 3rd and 4th in overall PAX if you apply a 0.975 street tire factor. They rewarded aggressive driving and were very responsive in transitions. The only thing we thought was lacking was brake grip - but with these tires, why use brakes?

DAMotorsports · 03-19-2013, 03:03 AM

We will be mounting 235/40/17 on the stock rims tomorrow. I will post some pics when she returns.

Gearhd79 · 03-19-2013, 01:05 PM

Quote:

Originally Posted by DAMotorsports

We will be mounting 235/40/17 on the stock rims tomorrow. I will post some pics when she returns.

What brand/type

DAMotorsports · 03-19-2013, 01:18 PM

We will be running the Toyo R1R this year, they are a 140 tread wear and slightly smaller then the stock tire diameter size. I have ran R1Rs on different cars in the past and they have exceeded my expectations. A great summer tire and in wet/light rain they still has great traction. I have not had the opportunity to drive in a heavy rain as I live in the desert area.

NYC BRZ · 03-20-2013, 12:36 AM

I ran 225 Z1s last year and just got 225 Z2s yesterday. It really is a nice sie for this car. Like it was mentioned earlier the 225 does suffer from a couple extra pounds vs 215 but you get a little better gearing (remember the BRZ/FRS 2nd gear tops out at 59 with stock 215s) I'll let you know how I like the Z2s in 225 this weekend.

Sent from my Galaxy S3 using Tapatalk 2

NYC BRZ · 03-20-2013, 12:43 AM

Forgot to say I'll have the Strano bar on this weekend too. Its been sitting in my house waiting for a quasi warm day to install. Well see what it feels like.

Sent from my Galaxy S3 using Tapatalk 2

TRev · 03-21-2013, 01:40 AM

Width of Rival 225/45 17 (front) vs Z1 235/40 17 (rear) both on a 17x7 rim.

Diameter of Z1 235/40 17 (front) vs Rival 225/45 17. The Z1 is at five tenths depth and the Rivals are stickers.

I will be running the Rival at all National events due to the contingency. If they had no chance it would be a different story. I tend to over drive a bit too so we should get along nicely.

03-17-2013, 02:34 PM	#101
xwd Senior Member Join Date: Feb 2012 Drives: 2013 DGM Subaru BRZ (Subie #9) Location: ATL, US Posts: 2,667 Thanks: 123 Thanked 861 Times in 552 Posts Mentioned: 32 Post(s) Tagged: 0 Thread(s)	245/40/17 is the A6 size to use and it works fine on a 17x7 rim. You can get the BFG R1-S in 235/40/17 but to me it's too short and works against the car's crappy rev limiter. 255/45/17 is way too tall. I tried fitting the 275/40/17 A6 and it wouldn't fit in the front, hits the front spring perch. I ordered a set of 225/45/17 Rivals to use to save the A6s and run RTR sometimes. I think they will work well. I know there were guys running 235 and 245 Star Specs on the stock rims with decent results, they have very stiff sidewalls for a street tire. Last edited by xwd; 03-17-2013 at 02:46 PM.

03-18-2013, 07:43 PM	#102
Simmons Senior Member Join Date: Jun 2012 Drives: 2024 GR86/ 2015 FRS Location: PA Posts: 961 Thanks: 306 Thanked 575 Times in 269 Posts Mentioned: 17 Post(s) Tagged: 0 Thread(s)	So I got to drive two RTR Brz's yesterday. One is Completly stock with 225 Rivals, and the other had alignment, Strano bar, and Z1's. I really liked the way the car with rivals worked, in one run with a passenger I was only 2 seconds off my time in my STX Brz. The other car had too much understeer for my driving. I really wish the Rivals were out in my size. Simmons __________________ 2024 GR86 71 STR/ 2015 FRS 71 STX Sponsors Xero-Limit//Karcepts

03-20-2013, 12:36 AM	#109
NYC BRZ AutoX Addict Join Date: Mar 2012 Drives: 08 Pontiac G8 GT,13 GBS BRZ Limited Location: Queens, NY Posts: 723 Thanks: 168 Thanked 118 Times in 83 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I ran 225 Z1s last year and just got 225 Z2s yesterday. It really is a nice sie for this car. Like it was mentioned earlier the 225 does suffer from a couple extra pounds vs 215 but you get a little better gearing (remember the BRZ/FRS 2nd gear tops out at 59 with stock 215s) I'll let you know how I like the Z2s in 225 this weekend. Sent from my Galaxy S3 using Tapatalk 2 __________________ 2013 BRZ Limited- GBS - 6MT -VIN #0937 ~~NYR SCCA # 18 C Street R (CSR)~~ "But there’s no mistaking the noise. This car is loud, and not in a particularly nice way. There’s no crisp exhaust note, no induction wheezing. It’s just the sound of petrol exploding in a metal box." - Jeremy Clarkson

03-20-2013, 12:43 AM	#110
NYC BRZ AutoX Addict Join Date: Mar 2012 Drives: 08 Pontiac G8 GT,13 GBS BRZ Limited Location: Queens, NY Posts: 723 Thanks: 168 Thanked 118 Times in 83 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Forgot to say I'll have the Strano bar on this weekend too. Its been sitting in my house waiting for a quasi warm day to install. Well see what it feels like. Sent from my Galaxy S3 using Tapatalk 2 __________________ 2013 BRZ Limited- GBS - 6MT -VIN #0937 ~~NYR SCCA # 18 C Street R (CSR)~~ "But there’s no mistaking the noise. This car is loud, and not in a particularly nice way. There’s no crisp exhaust note, no induction wheezing. It’s just the sound of petrol exploding in a metal box." - Jeremy Clarkson

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03-17-2013, 01:36 PM	#99
des Senior Member Join Date: Jun 2012 Drives: FR-S Location: Portland Posts: 131 Thanks: 33 Thanked 78 Times in 38 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Hoosiers can and should go bigger than you would with street tires -- they are cantilevered for just this reason. I don't know what CS folks are running, but I would suspect it's at least 245, if not 255. (I've seen fast drivers squeeze a 275 onto a 6-inch rim, so a 255 on a 7 would not be extreme.) On street tires 225s or 235s work, depending on the tire. Dunlops have stiff sidewalls, RS3s don't. There are rules changes afoot as well; if you can wait a few weeks there may be some guidance on what tires Stock will be running next year.

03-17-2013, 01:46 PM	#100
Gearhd79 Senior Member Join Date: Jun 2012 Drives: Scion FR-S Location: Pennsylvania Posts: 203 Thanks: 0 Thanked 14 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	im set...I've comitted to CS(RTR) this year and about to set up the suspention as per CS rules. I am trying to improve the car as my skills improve.

03-18-2013, 08:02 PM	#103
Gearhd79 Senior Member Join Date: Jun 2012 Drives: Scion FR-S Location: Pennsylvania Posts: 203 Thanks: 0 Thanked 14 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	right now im completely stock on ZII's and thinking of the strano bar with some really stiff endlinks and an alignment (crash bolts?)...BUT I want to see how the car is the way it is now before making too many changes

03-19-2013, 03:03 AM	#106
DAMotorsports Banned Join Date: Feb 2013 Drives: 2013 Scion FRS "Raven" Location: SoCal Posts: 503 Thanks: 335 Thanked 468 Times in 215 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	We will be mounting 235/40/17 on the stock rims tomorrow. I will post some pics when she returns.

03-19-2013, 01:18 PM	#108
DAMotorsports Banned Join Date: Feb 2013 Drives: 2013 Scion FRS "Raven" Location: SoCal Posts: 503 Thanks: 335 Thanked 468 Times in 215 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	We will be running the Toyo R1R this year, they are a 140 tread wear and slightly smaller then the stock tire diameter size. I have ran R1Rs on different cars in the past and they have exceeded my expectations. A great summer tire and in wet/light rain they still has great traction. I have not had the opportunity to drive in a heavy rain as I live in the desert area.

03-21-2013, 01:40 AM	#111
TRev Senior Member Join Date: Jun 2012 Drives: 2013 BRZ Location: WI Posts: 216 Thanks: 31 Thanked 63 Times in 40 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Width of Rival 225/45 17 (front) vs Z1 235/40 17 (rear) both on a 17x7 rim. Diameter of Z1 235/40 17 (front) vs Rival 225/45 17. The Z1 is at five tenths depth and the Rivals are stickers. I will be running the Rival at all National events due to the contingency. If they had no chance it would be a different story. I tend to over drive a bit too so we should get along nicely.

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