265/35/19 F / 285/35 R effects on understeer and vdc?

BobbyLight · 09-08-2016, 01:46 PM

Anyone ever ran this setup? I'm on OEM sport rays and wondering if it would help with some of the understeer our cars have.

Tire calculator says that would be 26.30 diameter front, and 26.85 rear.
Compared to stock, this is a -1.57% (fast) change in the front; and a +1.03% change in the rear (slow). Is that going to upset VDC?

I was looking at RE-11's and curious if anyone had tried this setup or something similar with more meat in the front. It seems many in the 370 world run a 3 tire size difference in stagger, opposed to the 1 or 2 that is commonly found on 350s.

cv129 · 09-08-2016, 03:33 PM

I ran 265/35 285/35 in RE11 for 15k miles, no VDC issue.

RumbleFish · 09-08-2016, 03:48 PM

I'm running 265/35 & 305/30 on Sport Rays...no issues

As for your size choice...why not something like 255/35 & 295/30
identical sidewall, radius, diameter and only minimal circumference dif (-0.2 in the rear)

even 255/40 & 285/35, the dia. dif is 1/10"

cv129 · 09-08-2016, 03:54 PM

^ because OP is trying to reduce the stagger to improve understeer.

cjwsrt6 · 09-09-2016, 08:41 AM

Could you run 285/35 square? I have ran this setup for autocross and loved it

Halfkiddio · 09-12-2016, 09:00 AM

Having run a 265/285 setup on my Z for 10k miles, They help with turn in, but they are bulging on the front sport rays. I will be going to a 255/40 on the front next time around, as well as going back to a 275/35 in the rear. They wear the same as a 245/275 setup, although these have been killed by bad bushings in the FLCA's that is causing drastic dynamic toe wear.

/Angelo350Z/ · 09-12-2016, 09:40 AM

What suspension mods do you have? Decreasing the stagger would definitely help reduce understeer, but a good set of sway bars can also do wonders. I run 265/35 and 305/30 RE-11s with Eibach sways and the Z turns in quite nicely.

09-08-2016, 01:46 PM	#1 (permalink)
BobbyLight Base Member Join Date: Apr 2016 Location: Charlotte, NC Posts: 97 Drives: 09 370z BS 6MT Rep Power: 9	265/35/19 F / 285/35 R effects on understeer and vdc? Anyone ever ran this setup? I'm on OEM sport rays and wondering if it would help with some of the understeer our cars have. Tire calculator says that would be 26.30 diameter front, and 26.85 rear. Compared to stock, this is a -1.57% (fast) change in the front; and a +1.03% change in the rear (slow). Is that going to upset VDC? I was looking at RE-11's and curious if anyone had tried this setup or something similar with more meat in the front. It seems many in the 370 world run a 3 tire size difference in stagger, opposed to the 1 or 2 that is commonly found on 350s.

09-08-2016, 03:33 PM	#2 (permalink)
cv129 A True Z Fanatic Join Date: Jul 2011 Location: Dallas, TX Posts: 3,250 Drives: 09 Nismo, 16 Nismo Rep Power: 163995	I ran 265/35 285/35 in RE11 for 15k miles, no VDC issue. __________________ Setrab \| RE-71 \| SPL \| JRZ \| Nismo \| ARK \| Whiteline \| RacingBrake \| CJM Oil Pan \| Ti shield

09-08-2016, 03:48 PM	#3 (permalink)
RumbleFish A True Z Fanatic Join Date: Oct 2013 Location: Los Feliz, Ca. Posts: 1,212 Drives: '10-Sport-M6 Rep Power: 8240	I'm running 265/35 & 305/30 on Sport Rays...no issues As for your size choice...why not something like 255/35 & 295/30 identical sidewall, radius, diameter and only minimal circumference dif (-0.2 in the rear) even 255/40 & 285/35, the dia. dif is 1/10" __________________ How far, this...Utopia? F.I. CBE V2/Stillen G3 CAI/GTM 25R OC/EcuTek tune (Specialty Z)/ KW V3's/Stillen Sway bars/SPC rear camber kit/Z1 FUCA/Mich. PSS4S 255/35-295/30 Last edited by RumbleFish; 03-30-2017 at 01:57 PM.

09-08-2016, 03:54 PM	#4 (permalink)
cv129 A True Z Fanatic Join Date: Jul 2011 Location: Dallas, TX Posts: 3,250 Drives: 09 Nismo, 16 Nismo Rep Power: 163995	^ because OP is trying to reduce the stagger to improve understeer. __________________ Setrab \| RE-71 \| SPL \| JRZ \| Nismo \| ARK \| Whiteline \| RacingBrake \| CJM Oil Pan \| Ti shield

09-12-2016, 09:40 AM	#7 (permalink)
/Angelo350Z/ A True Z Fanatic Join Date: Feb 2013 Location: Germany Posts: 2,230 Drives: Z34 \| MK7 \| F82 Rep Power: 3661	What suspension mods do you have? Decreasing the stagger would definitely help reduce understeer, but a good set of sway bars can also do wonders. I run 265/35 and 305/30 RE-11s with Eibach sways and the Z turns in quite nicely. __________________ 2013 MB NISSAN 370Z SPORT

09-09-2016, 08:41 AM	#5 (permalink)
cjwsrt6 Enthusiast Member Join Date: Apr 2014 Location: Alabama Posts: 452 Drives: 2005 crossfire Srt6 Rep Power: 11	Could you run 285/35 square? I have ran this setup for autocross and loved it

09-12-2016, 09:00 AM	#6 (permalink)
Halfkiddio Enthusiast Member Join Date: Jan 2015 Location: Knoxville Age: 30 Posts: 250 Drives: 09 RAE 370Z Rep Power: 11	Having run a 265/285 setup on my Z for 10k miles, They help with turn in, but they are bulging on the front sport rays. I will be going to a 255/40 on the front next time around, as well as going back to a 275/35 in the rear. They wear the same as a 245/275 setup, although these have been killed by bad bushings in the FLCA's that is causing drastic dynamic toe wear.

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