Quick Wheel/ Tire size questions...295's on stock 20x9's

[sswt00ss]

Yes, I have seen Nine Ball's wheel/ tire chart sticky. But questions remain. Stock FE4 suspension, no suspension mods. No plans to mod either.

Front Wheels: Running stock 20x8 front and want to run BF Goodrich Comp-2 A/S: 255/45/20. I don't see any fitment or rubbing issues for the front.

Rear Wheels: Running stock 20x9 and want to run Nitto NT555 G2: 295/35/20.

Nitto states the cross section is 11.84" wide, but when I divide 295/25.4, I come out to 11.6" section width. Will these 295's fit and clear all the suspension (no rubbing) and everything else in the rear without the use of spacers? Anyone running these that can confirm? Basically wanting to know if this setup is plug and play. Thanks in advance.

[Shoe2ss]

Yes please answer this please. I am wanting to know the widest tire I can run on the stock 9" rim also. lots of confusing talk and variable on everything I read.

[MCSarge]

I think the width is the least of your worries here. The 255 is 29.04 inches in diameter, the 295 is 28.13 inches in diameter. If the front and back tires are more than about a half an inch different in diameter they may throw a traction or abs light. Looks like you are about 3/4 inch difference right now. Someone correct me if I am mistaken but that is what my memory comes up with.

[sswt00ss]

Thanks for the replies. MCS, according to Nine Ball's chart, running a 29" overall diameter front 255 is fine. Also states that running a 28.1" overall diameter rear 295 is also acceptable.

Or am I mis-reading that you are talking about the front to rear diameters being different that might trip the TPMS? Do they work in unison like that and not independently?

I'm not making my decision for max tread width. I'm trying to match the overall diameter tire height if that make sense for tire revolution close to the Pirelli's currently on the car (factory tires specs on the P-Zeros). But if I can run a little wider tire, that would be an added bonus.

I have 3 different tire charts in front of me comparing the Pirelli's to the BFG Comp-2 A/S and Nitto NT555 GT's...I do as much research as possible before I even ask a question, but this is my first go around with 20" wheels, etc.

[MCSarge]

TPMS only measures the air pressure in the tires. I just ran the tire sizes you gave through a google search to look at the overall diameter. That is what will set off the ABS or the stabilitrak system if there is to big a difference in tire diameter, as the speed sensors on each wheel will see a difference in the rotation of the tires front to back and think there is a problem.

That being said, I only looked at the generic diameter of the tires in a search. You need to research each brand of tire you are looking at as they may not necessarily be the same diameter as the standard conversion.

[Shoe2ss]

so has anyone ran a 295 35 20 rear with the 245 45 20 front. is there to much size difference? or is it close enough to not set off the abs /traction system??

[sswt00ss]

MCS, thank you. I had a mental block and understand the wheel speed sensors. Are we at the point this is about tire revolutions per mile in relation to the overall tire diameter that could affect the ABS/ Stabilitrac?

I have those numbers in hand for all three brands:

Pirelli: Stock Tire sizes
F: 28.7" = 722-725 RPM (sources vary)
R: 28.7" = 722-725 RPM (sources vary)

BF Goodrich Comp-2 A/S: 255/45/20
F: 29" = 716 RPM

Nitto NT555 G2: 295/35/20
R: 28.11" = 739 PRM

I see where you have voiced the apprx. 3/4" overall tire diameter difference between the front and rear, respectively. That appears to be the gray area in all this...

EDITED: for Pirelli RPM number change

[SSEssence]

https://tiresize.com/calculator/

This is a handy link to have

[Avenging Orange]

In the immortal words of Jackie Chan. .."hahahahahaha....no!"
Really....for me...it's not whether or not it'll fit.....it's the point when it starts to enter the danger zone..
If you're spending money on the wider tires, why not just spend a few more and get the right wheel size?

[sswt00ss]

In using the link provided by SSE, it appears the RPM's listed for the factory Pirelli's is incorrect. When trying to confirm with Tire Rack, the RPM for the rear Pirelli's is blank. Couple other websites list them as either 722 or 725 RPM, respectively.

Of note: I never said I wanted to run a wider tire as my sole main criteria. I stated it would be an added bonus if it were possible. I'm fine with running stock sizes. My questions are in regards to possibly running a wider setup. And yes, I get the "Danger Zone" of to much tire, not enough wheel. Very good point to bring up for others. Cheers!

[1stgxp]

I run 305/35/20 on my stock 20X9 with no rubbing or any another issues whatsoever. (Mickey Thompson ET streets)

[MCSarge]

You want to stay within a half inch or less, otherwise you will throw an abs or traction light on the dash and that will effect other functions on the car, such as your cruise control will no longer work. If it triggers a check engine light for example your remote start won't work (is so equipped). I don't believe that this is something that can be programmed out.

[sswt00ss]

So to be clear, the tires sizes need to be within 1/2" or less between both front and rear tires combined in overall tire diameter...

...not within 1/2" of the overall tire diameter per pair of front and rear tires independently? That is how I am taking your comments.

If that's the case, sounds like it's just easier to stick to the stock tire sizes. I don't need to compromise other vehicle functions just for a little bit wider tread. Thanks.

[MCSarge]

Tire diameter not width is the issue. They cars sensors don't care how wide they are just that they are within spec as to diameter.