optimal street tire size for RTR on 17x7 - Page 3 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

GingerExtract · 09-09-2012, 06:02 PM

Good rule of thumb:

Street tires: More width is not necessary better
R-Comps: More width is usually better

My insights: I'm currently running a 235/45/17 Star Spec on a 17x8+45 RPF1 on my Mazda. It feels pretty well matched, although I am not noting a perceptible difference in terms of raw times from when I ran a 225/45 on the same wheel. However, the 225 felt much more crisp because it was just that slight bit more stretched. For a 7" wheel, I would stick with your stock 215/45. Compound > Width.

Kido1986 · 09-09-2012, 06:47 PM

Im completely happy with 215s on my 7". Do autocross and HPDEs on it, dont feel the need for more width

mechaghost · 09-09-2012, 07:26 PM

so do you lose more feeling in the wheel when you go wider?

ABQautoxer · 09-09-2012, 07:27 PM

If you are doing stock class autocross, do the 225/45 or the 235/40. Anything smaller is a poor choice.

xwd · 09-09-2012, 09:11 PM

Werd I would be running 235/40/17 Star Specs in RTR.

ABQautoxer · 09-09-2012, 09:21 PM

There were enough at nationals I got to see both mounted. The difference IMO looked fairly minor and there is a ~$48/tire difference in favor of the 225.

Kido1986 · 09-09-2012, 09:51 PM

Some prefer the sharper turn in of a stiffer sidewall of going more square to wheel. Not to mention 3lb per difference in RS3 from 215 to 225, due to XL rating

autoXracer · 09-10-2012, 12:16 AM

Quote:

Originally Posted by ABQautoxer

There were enough at nationals I got to see both mounted. The difference IMO looked fairly minor and there is a ~$48/tire difference in favor of the 225.

I agree! I went with the 225 for that reason.

ABQautoxer · 09-10-2012, 12:19 AM

Quote:

Originally Posted by autoXracer

I agree! I went with the 225 for that reason.

Wayne?

autoXracer · 09-10-2012, 01:07 AM

Quote:

Originally Posted by ABQautoxer

Wayne?

This is not Wayne, but I do know him lol..

mla163 · 09-10-2012, 09:03 AM

With the 180 treadwear requirement, it looks like all signs point to Starspecs, unless there is a new option next year.

Kido1986 · 09-10-2012, 09:28 AM

There will be a revised rating Hankook by January. I'll put money on it

ABQautoxer · 09-10-2012, 09:29 AM

Doubtful for two reasons. 1 the RS3 is discontinued and 2 road tire makes up such a small part of their business I doubt they would notice.

GingerExtract · 09-10-2012, 12:45 PM

Quote:

Originally Posted by ABQautoxer

Doubtful for two reasons. 1 the RS3 is discontinued and 2 road tire makes up such a small part of their business I doubt they would notice.

Wait, WHAT?!? They have only been out for about 2 years or so.

09-09-2012, 06:02 PM	#29
GingerExtract actually races Join Date: Aug 2012 Drives: Mazda3 Location: Columbus, Ohio Posts: 47 Thanks: 1 Thanked 8 Times in 7 Posts Mentioned: 0 Post(s)	Good rule of thumb: Street tires: More width is not necessary better R-Comps: More width is usually better My insights: I'm currently running a 235/45/17 Star Spec on a 17x8+45 RPF1 on my Mazda. It feels pretty well matched, although I am not noting a perceptible difference in terms of raw times from when I ran a 225/45 on the same wheel. However, the 225 felt much more crisp because it was just that slight bit more stretched. For a 7" wheel, I would stick with your stock 215/45. Compound > Width. __________________ Yes, that's my car in the avatar.

09-09-2012, 07:27 PM	#32
ABQautoxer Senior Member Join Date: Jun 2012 Drives: 2021 Supra / 2022 Tundra Location: Albuquerque, NM Posts: 659 Thanks: 60 Thanked 197 Times in 141 Posts Mentioned: 2 Post(s)	If you are doing stock class autocross, do the 225/45 or the 235/40. Anything smaller is a poor choice. __________________ TomR

09-09-2012, 09:21 PM	#34
ABQautoxer Senior Member Join Date: Jun 2012 Drives: 2021 Supra / 2022 Tundra Location: Albuquerque, NM Posts: 659 Thanks: 60 Thanked 197 Times in 141 Posts Mentioned: 2 Post(s)	There were enough at nationals I got to see both mounted. The difference IMO looked fairly minor and there is a ~$48/tire difference in favor of the 225. __________________ TomR

09-10-2012, 09:29 AM	#41
ABQautoxer Senior Member Join Date: Jun 2012 Drives: 2021 Supra / 2022 Tundra Location: Albuquerque, NM Posts: 659 Thanks: 60 Thanked 197 Times in 141 Posts Mentioned: 2 Post(s)	Doubtful for two reasons. 1 the RS3 is discontinued and 2 road tire makes up such a small part of their business I doubt they would notice. __________________ TomR

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09-09-2012, 07:26 PM	#31
mechaghost Senior Member Join Date: May 2012 Drives: Silver AT Limited Location: Seattle Posts: 823 Thanks: 145 Thanked 344 Times in 159 Posts Mentioned: 17 Post(s)	so do you lose more feeling in the wheel when you go wider?

09-09-2012, 09:11 PM	#33
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)	Werd I would be running 235/40/17 Star Specs in RTR.

09-10-2012, 09:03 AM	#39
mla163 Overthinking it Join Date: May 2012 Drives: BRZ in CS Location: DC Posts: 271 Thanks: 27 Thanked 81 Times in 48 Posts Mentioned: 1 Post(s)	With the 180 treadwear requirement, it looks like all signs point to Starspecs, unless there is a new option next year.

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