Pilot Sport 4S tyres Porsche rated!

II Co-Pilota,
Is it ok to mix these for MPS4S for F8?
245/35R20 K1
305/30R20 N0

Thanks

 

Generally speaking, it is not advised to mix tyres with different markings (e.g. K and N) - it is better to go for a homogeneous mounting (i.e. all N0 in this case).

 

this is going to be an important question, as some of us have run through the OEM tires already on the F8 and it's time for replacement. There is no direct PS4S fit.

 

Probably no issues just driving around the street. However my OCD would eat me alive... either do all NO or all K1 or just pick the non-rated 4S version. There are belt lay up, compound and slight width differences in the manufacture spec versions....but keeping both fronts the same marking and both rears the same marking is fine.

Tirerack has the stock Michelin Super Sports in K3 in stock, Pirelli P Zero PZ4 K02 in stock, Michelin Pilot 4S non- manufacture rated in stock.

I've never seen Tirerack having both Michelin PS4 K1 Ferrari tires in stock.

 

Ballie64. How did the lusso spec tires work on your 458?

 

I have the same thing with my AMG GTc-- my shop put the PS4S on and I noticed months later that they said NO (Porsche)- when I called and asked him, he said it was a supply thing and the MO wasn't available but he said it doesn't make a difference so... I don't know, guess they're fine.

 

Thanks. The 245s are slightly larger in diameter than the 235s (.3”) so was wondering if that upset some of the stability controls. Don’t know how sensitive they are to things like that.

 

I havent studied the differences in K1 vs others in MPS4S, but I know for a fact that a N2 325/30/21 cup 2 on my gt3rs is a full 1.5" wider than a regular 4S despite being the exact same tire size and rating. If anything, your NO might be wider than a standard ps4s. So tire size is one thing but their actual width differs from different ratings (K1 K2 K3 N0 N2 MO1 etc.) not just the advertised tread depth differences

 

this is not correct

 

I just ordered the Michelin PS4S 235s and 295s for my 458 Spider so I’m sticking with stock sizes. However, it would be very interesting to know how the stability system works and what parameters/ inputs it uses.

 

Despite controlling the rear brakes, the CST receives multiple inputs, including the rotational speed of each front wheel. If the ratio of the outside diameter of the fronts to the rears varies too much from stock, it will throw off the calibration in unexpected ways. A too small or too big diameter tire will rotate faster or slower for the same speed of the car, which could be interpreted as slip. You really don’t want to find out how it misbehaves at an inopportune time.


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This is correct

 

Blasphemy

 

I went with K1 front and N0 rear. This was ordered before I asked the question. Next time I will go N0 all around.

The N0 seems to be wider than K1, and wider than oem PZ4 of same size, it looks awesome. My impression after 200 miles, car is so much more fun to drive, maybe 2x more fun for me, and seem to be getting better and better with each drive. My PZ4 only had 2500 miles on them.

When rear breaks loose with PS4S, it doesn't feel unstable and tail doesn't move left or right, I can stay on throttle and it regain grip so much faster than PZ4s. The PZ4 was all over the place until tires are really warm, I once broke rear traction in 4th gear in dry going straight in a cold day in PZ4.

I just feels so much more confident with PS4S even when tires are cold, I even drove it once in rain, and it did surprisingly well. Only regret I have is not swapping out PZ4 with PS4S sooner.

 

I'm going to make a main thread on this, as many of us are nearing the first tire replacement on the F8's.

 

245 number on tire mostly is the width rating…. What you need to be careful of and we are trying to explain is the overall tire diameter of the front tire and rear tire differences. That measurement needs to stay the same or I believe with in a couple % as you move up or down in tire sizes in front and rear. For example say the difference between front and rear tire diameter oem stock is .4” then as you move up in wheel-tire size you need to pick front and rear tires that are right at .4” diameter difference front to rear.

 

That depends.... I'd have to go on tire rack.com and get the overall diameter difference between the 2 tires. I do not know the aspect ratio as you've not posted that.... 235/35/20 or 235/40/20...big difference.
Usually rule of thumb is for modern day cars it seems that if you keep the front to rear overall diameter difference no more than .2"- maybe .4"max with in stock overall diameter difference you are fine.

 

Be very carefull buying MPS4@ at this moment (at least over here in Europe) !

Availability is not good.

Beware of the DOT (date of tyre) ... we get only tyres offered which are already 2- 4 years old.



There are now "normal" MPs5 tyres on the market, but they have no homologation codes K yet.

I wait for the MPS5S