Track tire size

Mn23 · 04-28-2020, 03:59 PM

Hey guys, after some research seems like a lot of track guys suggest 275/35/18 because of the wide availability. Is there any disadvantages going 305/35/18 on my NA Z with 10.5” rim? Slows down the car in the straight but better cornering?

Thanks

gomer_110 · 04-28-2020, 04:31 PM

You want a square setup over a slightly wider tire to have the best handling. Putting a noticeably wider tire in the rear is just going to create a lot of understeer. Also, last I knew 285's are the width a lot of the track guys are using.

Mn23 · 04-28-2020, 05:40 PM

Yes I meant square setup. 275/35/18 vs 305/35/18

OptionZero · 04-28-2020, 07:33 PM

Unless you’re turbo’d that much tire seems like overkill
And fitting that much tire will require more camber and fender work

loufitness · 04-28-2020, 07:54 PM

I run 275/40/18....
I do not see any value in running anything wider than 285 on the track. Beyond that you are just adding more un-sprung weight for no value.

Mn23 · 04-28-2020, 08:51 PM

Thanks! Looks like I’m down to either keep running 275/35/18 RE71R or try 285/35/18 RS4

SS_Firehawk · 04-28-2020, 10:59 PM

I currently run 275/35/19 and 305/30/19 on track. I still run my stock sway bar on my Nismo. The car is fairly neutral. Slight understeer if any on aggressive turn in, slight oversteer if I'm running out of grip.

Hotrodz · 04-29-2020, 05:41 PM

I run wide tires because I am boosted but I know of a few serious track rats that are really fast that run 315 square N/A. I think if you are fast it is what you comfortable with. Most run 275 35 because of cost and class restrictions depending on time attack rules and class. I think a lot more folks would run wider tires if not for those two considerations. Also a square 295 30 works as well.

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Mn23 · 04-29-2020, 09:33 PM

Quote:

Originally Posted by Hotrodz

I run wide tires because I am boosted but I know of a few serious track rats that are really fast that run 315 square N/A. I think if you are fast it is what you comfortable with. Most run 275 35 because of cost and class restrictions depending on time attack rules and class. I think a lot more folks would run wider tires if not for those two considerations. Also a square 295 30 works as well.

Sent from my SM-G965U using Tapatalk

Now you got me thinking about the 305/35/18 Toyo RR lol, only thing is I will not want to drive to the track with these.

Hotrodz · 04-29-2020, 10:18 PM

Quote:

Originally Posted by Mn23

Now you got me thinking about the 305/35/18 Toyo RR lol, only thing is I will not want to drive to the track with these.

Don't see many running 305 square on a Z. Mostly 315 or 295. Not sure why that is other than availability and cost.

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danegrey · 04-30-2020, 09:15 AM

thanks for the info in this tread, making me think on what I what to change to, I have a set of wheels that are 18's. will look at going square, like what I have found out

SS_Firehawk · 04-30-2020, 02:26 PM

If you're running really wide fronts, I recommend getting a letter power steering cooler. You're going to work the hell out of it.

BGTV8 · 04-30-2020, 04:43 PM

I run 275/35R18 on 9.5" Enkei for wets and 27/65R18 Michelin Slicks (actually Porsche Cup fronts) on 10" Braid Forged. Alternative slick is Pirelli 285/655R18.

Square all round makes for better balance - Unless you are boosted and running mega torque, I'm not sure that anything bigger than 275/285 provides a benefit

Elmo370z · 04-30-2020, 09:17 PM

Quote:

Originally Posted by BGTV8

I run 275/35R18 on 9.5" Enkei for wets and 27/65R18 Michelin Slicks (actually Porsche Cup fronts) on 10" Braid Forged. Alternative slick is Pirelli 285/655R18.

Square all round makes for better balance - Unless you are boosted and running mega torque, I'm not sure that anything bigger than 275/285 provides a benefit

How’s the car coming along

Rusty · 04-30-2020, 10:58 PM

Quote:

Originally Posted by Elmo370z

How’s the car coming along

04-28-2020, 03:59 PM	#1 (permalink)
Mn23 Base Member Join Date: Jun 2016 Location: GTA Posts: 49 Drives: 17 Black 370Z Rep Power: 10	Track tire size Hey guys, after some research seems like a lot of track guys suggest 275/35/18 because of the wide availability. Is there any disadvantages going 305/35/18 on my NA Z with 10.5” rim? Slows down the car in the straight but better cornering? Thanks

04-28-2020, 04:31 PM	#2 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36941	You want a square setup over a slightly wider tire to have the best handling. Putting a noticeably wider tire in the rear is just going to create a lot of understeer. Also, last I knew 285's are the width a lot of the track guys are using. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

04-28-2020, 07:33 PM	#4 (permalink)
OptionZero A True Z Fanatic Join Date: Apr 2011 Location: Sacramento Posts: 3,262 Drives: 15 370Z Nismo 6MT Rep Power: 214101	Unless you’re turbo’d that much tire seems like overkill And fitting that much tire will require more camber and fender work Mn23 likes this. __________________ OptionZero Build Thread

04-28-2020, 07:54 PM	#5 (permalink)
loufitness Base Member Join Date: Apr 2014 Location: Louisville, Ky Posts: 74 Drives: 14 370Z Pearl White Rep Power: 3367	I run 275/40/18.... I do not see any value in running anything wider than 285 on the track. Beyond that you are just adding more un-sprung weight for no value. 2011 Nismo#91, Mn23 and Jmatchley86 like this. __________________ 2014 Pearl White Sport Pkg / Motordyne Shockwave / 25 Row Setrab / SS Brake lines / Motul RBF 600 / Hawk DTC-60 / SPL Upper Control Arms / Enkei RP07 / Hankook RS4 275/40/18 Square / Schroth Harness / EVO-R Carbon Fiber Accents / Bilstein B16 PSS 10

04-28-2020, 08:51 PM	#6 (permalink)
Mn23 Base Member Join Date: Jun 2016 Location: GTA Posts: 49 Drives: 17 Black 370Z Rep Power: 10	Thanks! Looks like I’m down to either keep running 275/35/18 RE71R or try 285/35/18 RS4 cv129 and Jmatchley86 like this.

04-28-2020, 05:40 PM	#3 (permalink)
Mn23 Base Member Join Date: Jun 2016 Location: GTA Posts: 49 Drives: 17 Black 370Z Rep Power: 10	Yes I meant square setup. 275/35/18 vs 305/35/18

04-28-2020, 10:59 PM	#7 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7335	I currently run 275/35/19 and 305/30/19 on track. I still run my stock sway bar on my Nismo. The car is fairly neutral. Slight understeer if any on aggressive turn in, slight oversteer if I'm running out of grip. Hotrodz likes this. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

04-29-2020, 05:41 PM	#8 (permalink)
Hotrodz A True Z Fanatic Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684385	I run wide tires because I am boosted but I know of a few serious track rats that are really fast that run 315 square N/A. I think if you are fast it is what you comfortable with. Most run 275 35 because of cost and class restrictions depending on time attack rules and class. I think a lot more folks would run wider tires if not for those two considerations. Also a square 295 30 works as well. Sent from my SM-G965U using Tapatalk Corsairprime and Mn23 like this. __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

04-30-2020, 09:15 AM	#11 (permalink)
danegrey A True Z Fanatic Join Date: Oct 2011 Location: Knoxville Age: 72 Posts: 3,194 Drives: 12 370Z BK Cherry M6 Rep Power: 649540	thanks for the info in this tread, making me think on what I what to change to, I have a set of wheels that are 18's. will look at going square, like what I have found out __________________ Lots of Changes the Z needs to be driven and driven hard for the car lives for it

04-30-2020, 02:26 PM	#12 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7335	If you're running really wide fronts, I recommend getting a letter power steering cooler. You're going to work the hell out of it. JARblue, gomer_110, Rusty and 1 others like this. __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction Last edited by SS_Firehawk; 04-30-2020 at 10:10 PM.

04-30-2020, 04:43 PM	#13 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,515 Drives: 09 Nissan 370Z M6 Rep Power: 39974	I run 275/35R18 on 9.5" Enkei for wets and 27/65R18 Michelin Slicks (actually Porsche Cup fronts) on 10" Braid Forged. Alternative slick is Pirelli 285/655R18. Square all round makes for better balance - Unless you are boosted and running mega torque, I'm not sure that anything bigger than 275/285 provides a benefit Hotrodz and loufitness like this.

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