Can i go with 295 PS4S on stock sedan wheel? Car is not lowered. Currently running pirelli p zero 285 with no issues, but i want to go up a size.

 

It’s not recommended. Michelin lists a 10” rim as the min rim width for a 295 35 19 P4S. I believe the stock sedan rim width is 9.5”.

 

I am running 295s on my 9.5 E63 wheel. I also have the 295 Pzero audi spec. they were almost an inch and a half wider then my 285, pzero. The pzero 285s seem to be a narrow 285.


They do bulge a little, but hook up.

 

I believe Michelin offers a 30 day return with Tirerack so just try it.

 

too wide for 9.5. there are a few threads on here with pics of people putting a 295 on the 9.5 wide wheel. it looks way bulgy and any reputable tire shop wont install it. it will most likely feel unstable and floaty at high speed.

just email michilin to make a 285/30/19 in the michilin 4s and our problem will be solved. the problem is they only make a super sport in that size as of today.

 

yeah thats the main problem, they don't make the 285. Any other tires that are atleast close to ps4s?

 

What about the 20in option wheels? Can we run a 295 on that?

 

Do you have any pics installed? Curious to see how much bulge there is. I have a set of new 295/30 super sports that I’m debating installing on the 63

 

I believe those should be more narrow than the p zero

 

Just got 295 30 19 PSS installed on the rear. Look at the size difference between the Dunlop 265 vs the PSS 295. No rubbing so far but I’m at stock height.

 

Looks awsome dude! 295 ps4s it is once i 🔥 my pirelli's off. Ohh are you running any spacers ?

 

No spacers. The 295s line up with the fender nicely. The bulge is quite pronounced but nothing wrong with that.

 

Great, how is the traction with those? Bet the car hooks up in 2nd now ;]

 

Wow those 295 tires look absolutely steamroller next to the 265..

However I do not think it's a great idea to put 295 on a 9.5" wheel, the tireis compressed too much on the rim and you may get some strange wear on it and you will not get the full 295 width or full contact patch out of it. I'd bet the 295 is probably resulting in no bigger contact patch than a proper-fitting 285 on the same rim.

 

Maybe. Lowering the psi a little bit will fix the contact patch issue right up, It looks good and it probably hooks much better then stock 265.

 

No, but good luck and enjoy!

 

285 30 19 would be ideal but i cannot find pilot sport 4s anywhere in that size. Out of stock? Never made?

 

they don't make them.

 

yeah i could not find them anywhere i guess 295 is the way to go.

 

If you are running the same tire pressure, a 265 tire and a 295 tire will have basically the same size contact patch. What will be different is the shape of the contact patch, the "evenness" of the load across the contact patch, and how that contact patch changes as the load on the tire changes.

By mounting a tire that is too large for the wheel, you will have a wider but shorter shape with a less-uniform load across the contact patch. You'll also have a significantly higher amount of change across the patch, especially under cornering/lareral loads.

Think about it this way. It's like wearing a running shoe that is too big for your foot. Is there more rubber on the ground? Yes. If it's a little on the big side but still fits, will is give you an advantage? Maybe, it depends on the specific situation. Will a shoe that is significantly too big for your foot going to give you an advantage? No, because your foot won't be stable inside the shoe and you'll end up tripping over your own feet.

 

I have a hard time understanding this. Please explain 🤔

 

Each tire on the car is supporting a percentage of the car's overall weight (known as weight distribution). That load can be determined simply by placing individual scales under each tire and measuring the force applied. If you sum up all 4 scale meausrements, it will equal to the overall total weight of the car. Simple physics. We won't get into how those loads drastically change while driving (refered to as weight transfer), but it does directly apply to why tires too large for the qheels are a bad idea.

Lets say your car weighs 4,000 pounds and you set all 4 of your tires at 40 psi. Assuming completely equal weight distribution, each tire is feeling 1,000 pounds of force from the weight of the car (1,000 x 4 = Total Weight). The air inside the tire is at a given pressure that supplies an equal force to counteract the force it feels from the weight of the car. That force is distributed over a surface area of the tire's tread in contact with the road (known as the contact patch). In this case, the 40 PSI supplies 1,000 pounds of force, creating a 25 square inch of contact patch (1,000 / 25 = 40).

This is independent of tire width. Both a 265 tire and a 295 tire will create that same 25 square inch contact patch. What changes is the shape of the contact patch and how evenly the force is applied across the contact patch.

And what matters most is dynamically how that contact patch changes while being subjected to the ever-changing loads it feels while driving; acceleration, braking, cornering, and especially how it transitions between those states.

Edit: I should also add that in reality it is way, way more complicated than I described above, but without going through a few years of Engineering classes, the explanation above will have to do.

 

Your a smart man. All of that makes sense now. So a 295 tire on a 9.5 rim won't give me better of-the line traction vs 265 tire on 9.5 rim?

 

A properly-fit wider tire will give you better traction if run at a lower pressure since the lower pressure at the same weight load will increase the contact patch area. You'd want to decrease the pressure to make the contact patch, when compared to the smaller tire, the same length (front of car to back) but with the added width. So, theoretically, yes.

But the amount of grip you will gain will be pretty much unnoticeable to anyone but professional-type drivers that know what they're doing at the limit. You, along qith 99% of people on here, won't notice a difference.

And I'm not all that smart. Ask my wife. But I do have a Mechanical Engineering degree and almost went to work as a Race Engineer for a sports car team when I was not long out of school.

 

Sounds like my dream job right there. Thanks for the info. 🍺🍺