flaps720

I've been searching but couldnt find a particular thread dedicated to asking if a particular wheel/tire setup would work... My last forum had a sticky to a "The will it fit thread" in their wheel section...

I have a set of 19x8.5 +35 Axis Hiros (all four) and was hoping I could get these to work on the Z without upsetting the VDC or negatively impacting the handling. From my research I think this will work, but would like a veterans confirmation/suggestions...

Can I run 19x8.5 +35 all around with 255/35/19 on the rear and 235/35/19 on the front? I have an '03 Performance.

Thanks for any help and if there is already a similar thread or place to ask this, any guidance would be appreciated!

davidv

iTrader: (2)

Difference in circumference is 43.98/2032.92 or 2.1 percent. This may not be compatible with VDC.

flaps720

Damn, I wish I knew how you were plugging away at this... Basically I just bought brand new 255/35/19 tires when they were on my rx8 and the other two (which would be the fronts for the Z) need to be replaced and I am trying to figure out what size I would need. Theres gotta be a tire that would bring me closer to that needed threshold to comply with the VDC, right?

and thank you for your help as well!

terrasmak

iTrader: (8)

Just sell those wheels and start fresh.

255/35-19 is the proper sized front tire for a Z

davidv

iTrader: (2)

Rules for VDC and tires are not etched in stone. Here you begin with a short tire. Actual speed 100.0 MPH. Speedometer will read 102.51 MPH. Now you must find an odd size for the front.

flaps720

ultimately im going to go with new tires and wheels all together since 8.5" wide is not where I wanna be, but since I just dropped thousands of dollars on the Z and have these wheels, I was gonna run them for the time being, IF I can set it up to work with the VDC.

Terrasmak, you said they are short and will look lame, to which Im not offended, but do you really think it would look that bad or awkward? I figured its not much different than the stock sizes, right? I am under the impression that my current stock wheels were 18x8 front and back (2003 v1 Performance wheels) and the current wheels in question are 19x8.5

terrasmak

iTrader: (8)

Run a 255/40 out back with your 255/35 up front. The combo will be ever so slightly taller that stock tires (over all diameter) and will work great.

Find some spacers, and your set for a while till you find some quality wheels.

terrasmak

iTrader: (8)

He already did (235/35) as he mentioned in POST #1 of this thread, do you even read posts and think about what people are asking? His first post is asking if he can run a 235/35 front and 255/35 as a rear. Yes he can, the stagger is the same as OEM, the speedo part you keep mention doesn't even matter. Yes they are short for the car and will look lame, but they will work just fine.

Reposted in an effort to get the proper info out and not hurt anyones feelings.

flaps720

Thats what i needed to hear, thanks.

Waiz

iTrader: (57)

OP, I would also recommend this thread as well for future reference since it lists our most common questions:

https://my350z.com/forum/2003-2009-n...questions.html

In that thread here is where you would have found your answer that would have confirmed your research:

https://my350z.com/forum/4936171-post42.html

flaps720

Thank you and I appreciate you directing me to a related thread, however, I did read and re-read all the common threads, especially that particular section before posting, as the common sizes mentioned in the "100 ?'s" thread does not directly address my scenario with 19x8.5 wheels all-around. I did however use that section as a reference when asking a veteran to confirm if I would be maintaining close to a factory stagger with the dimensions referenced in my OP.

Just didn't want people thinking I'm posting blindly or didn't read through the forums rules and etiquette first!

haha, i've actually been rather sleep deprived this past week as I have been up so late at night lurking around on the forums. So far, this was the ONLY answer I haven't been able to find on my own

Waiz

iTrader: (57)

^I could tell that you had tried to answer the question on your own by doing some research, you just needed some affirmation

flaps720

precisely! haha sucks being the new guy in town

flaps720

Are the characteristics of the VDC and the Z's handling related more to the disparity between the width of the tires from front to back, or the difference in overall height/circumference of the tires?

And if the answer is for the disparity in overall height/circumference, is the difference in tire widths on the Z strictly to achieve the proper stagger via aspect ratio, or are they purposely different (by 20mm on most stock setups it seems) to achieve certain handling qualities?

terrasmak

iTrader: (8)

Tire height, rears need to be taller than the front.

They stagger the tires in width from the factory to promote understeer. The common OEM tires are 225/45 front and 245/45 rear, some people swap the fronts to 245/40 and keep the rear OEM size to make the car more neutral.

flaps720

it all makes sense to me now... thanks a million, this really helps me immensely in figuring out how to run my setup for the time being.

davidv

iTrader: (2)

VCD expects to see a difference in wheel RPM. For simplicity we measure overall tire height or circumference. For example if front wheel RPM is 1,000, and rear wheel RPM is 3,000, VDC knows that something is wrong: this is a understeer situation, and VDC will react appropriately.

On the other hand, TCS is a rear axle ONLY system. Rear right tire at 100 RPM. Rear left tire at 1,000 RPM. TCS knows that the left tire has lost traction, and will react appropriately.

Tire width affects handling characteristics: under and over steering. Autocross drivers will often run a 4-square set up or same tire width all around. This may reduce understeer. Remember autocross is a "controlled" situation. 4-square may not be suitable for the street.

flaps720

^^ Thanks david. I just like to know as much as I possibly can about EVERYTHING. I read and research plenty, but sometimes its just easier to ask... thats what the forums are for right!?

Everyone has been a big help so far in helping me understand it all. I've been using the DML Tire and Wheel calculator you posted prior as well. Still deliberating on the direction I want to go, and now I am pretty sure I have a clear grasp on it all. Now if I can just sell off some of these old RX-8 parts, I can just start from scratch and get brand new wheels and tires

davidv

iTrader: (2)

Cool. The possible combinations of wheels - tires is infinite, and can be overwhelming. If you understand speedometer accuracy and VDC, life is simple.