Michelin PS4s tyre pressures

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Measure your tire pressure before driving, not after, for the most accurate reading. This practice is referred to as setting the cold tire pressure. The 458 recommended tire pressure is 33 PSI (see my pic), that means 33 PSI before you put rubber to the road and the tires heat up.

 

Interesting. My car originally came with Michelin Pilot Super Sports and the sticker says 30f/29r. Since going to 4s, the sidewalls seem a bit softer, so 31/30 seems ideal.


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Sidewall stiffness has little to do with anything. You increase volume, you decrease pressure.

We can talk cold pressures till we are blue in the face, but what matters is what happens during your drive. Here's what experience tells us. Those fronts like to sit around 2.1-2.2 bar hot. So go for drive like you normally would, not faster, not slower, just what you normally do for a good drive. Bring your gauge and when you are in say 20 mins and things are stable, pull over and set your pressure. For street driving, set fronts to 2.2 and rears to 2.1 bar.

That way you avoid pressure and sudden temp spikes. If your tpms acts up, just reset it in the morning when cold. I'm guessing that your cold pressures end up between 1.8 and 1.9 bar.



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This car originally came with Bridgestones and I changed them to Pilot Super Sports. So you’re saying there are different pressures for the same sizes tires, listed on the door sticker? That’s seems a bit crazy that for every brand Ferrari changed the numbers for the same sizes.

 

Must be. My sticker has different pressures and came originally with Michelins. I recall seeing in the manual different pressures for different brand tires.


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way too high

 

I set my new p-zero’s to the suggested 2.1 front 2.0 rear (cold) and they were great on my recent road trip. Hot temps were around 2.3 from memory.
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Thanks for sharing the manual excerpt. My sticker is 30/29, obviously car was not delivered with Bridgestones.

I can't wait to get rid of my Pirelli and install Michelins in spring. The PS4S is a phenomenal tire. Had it in the rain on the GT3 at the track last month, was very impressed.

M

 

I couldn’t get MPS4’s so went p-zero. Went on a long road trip around a very wet Scotland earlier this month and was very glad I wasn’t on the original (8 y/o) tyres.

I’m not convinced the p-zeros will wear as well as the Michelin’s but so far so good (once they have some heat in them).


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The Michelin Pilot Sport 4s and Pilot Super Sport are both great great tires. If you can’t find the 4s, the Super Sport is the same just slightly less wet traction than the 4s but minimal. Both of these are no comparison to the Pirelli

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I recently changed to the MPS4S and installed 305/35/20 in the rear and 245/35/20 in the front. This was recommended by Co-Pilota. No issues at all and I’m very happy with this choice.
However, I had to wait over 6 months to get them. The 305/35/20 for the rear were on back order. I’m glad I waited and received what I wanted.

My question is, what is the proper air pressure? Ferrari dealer set the tire pressure cold to 33 all around as stated on the sticker. My 458 Spider came with Bridge Stone tires from the factory.

My ride feels a bit lofty and bouncy. Any thoughts on this?
What de you recommend Co-Pilota?

Thanks,
Ray

 

My car came with Michelins from the factory, which specifies 30 psi front and 29 psi rear. The 4S seems a bit softer so I run 31/30.


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You have increased the volume slightly, so you need to lower itca bit. 33 cold is way off, and I'd imagine that it would feel quite darty and loose.

Try 30 front and 29 rear. You are aiming for about 32 squared when at about 85-95F.

The old Bridgestones were pretty rough, so it will never be like that. But that's not a bad thing. The car will be more settled and the suspension more capable.

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As I recall, there are still no PS4s for the F8, right?

 

Correct.

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I also run the PS4S and I run 31/30 (manual for PSS Michelin states 30/29).

 

I aim for 32/32 hot
usually means 30/29 cold

 

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The Michelin destroy the Pirelli. I’m also a dealer for tires and can put whatever I want on any of my cars and that’s still the only one I will use. The PS4S or the Pilot Super Sport. Both incredible.

 

This thread extremely interesting, thanks to all of those commenting. Particularly the pressure changes. My car came with Pirelli’s originally and I’ve been keen to get some PS4S onto it.

I recently fitted a complete set of PS4S to my 458

Michelin Pilot Sport 4S 235/35 ZR20 (92Y) XL
Michelin Pilot Sport 4S 295/35 ZR20 (105Y) XL

These were really hard to locate, Michelin confirmed that these had been discontinued (the fronts I believe) and when I did eventually find somewhere that had them they sold out almost immediately.

Did I make a mistake fitting these?

I fitted these as there were no K versions available and after seeing lots of threads regarding traction issues I decided to stay on the original sizes.

Though from the previous posts it looks like I could of fitted K rated 245 and 305 without any issues? Presumably from the 488

Should I of gone with them over what I put on?

 

I will go ahead and lower the tire pressure to what you have recommended.
Will follow up and advise how the change affect the ride and handling..

Thanks a ton,
Ray

 

The 245 and 305 fitted great on my 458. Just a bit wider and makes a slight difference in the look. I waited a long time to get the 305 so expect to wait. I haven’t checked if they are available though.

Ray,

 

When changing to different tires I start out with OEM spec and move up/down from there. For the front its easy to know when too firm or too loose by the grip and the hardness over slightly bumpy road. You can feel a 1/2 pound easily. For the rear its a little harder but I like to do it by feel and grip. Also check the sidewall shape and shoulder wear to make sure not going too low or high.