458 Tire Size

Image Unavailable, Please Login I did fit the 305's three months ago and drove more than 4000 km's with them (Italy and back), no ECU problems at all

 

So did you fit the 305's on the standard 458 rim? Hard to believe they will fit on the standard 458 width rim. I guess the real question is: are the Speciale rim widths and the standard 458 rim widths the same?

Thanks

 

458 rims are 8.5"J20 front, 10.5"J20 rear while Speciale rims are 9"J20 front and 11"J20 rear.

But for a specific tyre width there is typically a range (spanning 1" to 1.5") of acceptable rim width.

 

Thanks

 

So can you fit the Speciale tires with the Novitec spring set to lower a 458? While your at it - can you also add the 10, 20 or 30 mm spacers with the tires and springs? Obviously with not rubbing.

 

Yes. no problem a all

 

my mechanic is concerned that even putting a 285/35/20 instead of the OEM 295/35/20 will cause some bad calculations to the stability control....
i am surprised to find the 305/30/20 runs perfectly ok. Did stability control ever kicked in too early? or u drive with it off all the time lol

 

I have 21 rear wheels 13 inch wide with 355/25/21 tires and new TPMS sensors, fronts 20 inch 9inch wide wheels with 245 35 20 with no problems. Ride height increased though in the front by 1/2 inch. No error codes so far...

 

If the traction control can comprehend the differences between trofeos/pilot cups and Bridgestones it seems a bit of difference in the tire width should not be a problem...

SV

 

Hopefully the formatting below stays intact. I took a little closer look at the overall tire sizes. The Speciale tire (305/30) is .925 inches smaller diameter than the original 458 (295/35). By going to a 35 aspect ratio on the 305 tire, it appears to better replicate the original 458 tire size. Compared to the original 458 rear tire, the 305/35 is .275 inches greater diameter vs. the 305/30 which is .925 inches smaller diameter. Basiclally its a .97% error vs a .3.2% error per wheel revolution.

Width Aspect Ratio Overall Tire Diameter
Rear
458 Original 295 35 28.130
Speciale 305 30 27.205
Optional 305 35 28.406
Front
458 Original 235 35 26.476
Speciale 245 35 26.752

 

Is there anyone suggesting which sizes I should go for my Italia?
What a pity that 305 35 20 isn't available for both PS4S and Cup 2.

 

My dealer is installing new rear tires on my forged rims today.
They are the MPS4S. Michelin is now producing the needed sizes front and rear.
Front tires weigh 23 and rears weigh 32 according to tire rack

https://www.tirerack.com/tires/TireSearchResults.jsp?tireIndex=0&autoMake=Ferrari&autoYear=2014&autoModel=458+Spider&autoModClar=&frontWidth=235%2F&frontRatio=35&frontDiameter=20&frontSortCode=59853&rearWidth=295%2F&rearRatio=35&rearDiameter=20&rearSortCode=60157

 

Is the MPS4 now F approved in K version available (like MPSS K3) ?


Greetings from Mel in The Netherlands.

 

The rears are Ferrari Ks
I switched my fronts about 5 months ago. At that time the K was not offered.

But compared to the MPSS and P zero, which I had on my fronts, the 4S were noticeable better

 

So compared to the old MPSS the 4S certainly has better grip.

Although my old MPSS still had plenty of tread , I’d gotten two puntires and the last one was at the edge of the contact surface so it was time to replace the tire.

Fortunately, my dealer got his first shipment of the S4 in the correct size.

Unfortunately the new PZ4 are not available in the correct size for the 458.
Using the old P zero would be a mistake

The MPS4s are pretty awesome!

 

Guys I'm due for tires soon. So it seems the Michelin's are the best to go with? Not tracking my car so PSS good enough?

 

What tires are you considering?

Here is my ranking
#1 MPS4
#2 MPSS
#3 PZ3

 

Probably number 2.


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I really felt an improvement in steering feel with the MPS4 tire. It was noticeably better than the MPSS or the PZ3.
FWIW you can compare the rating and other metrics of a wide variety of 458 compatible tires on the tire rack site.

 

Please note the confusing Michelin terminology - the Michelin PS4 IS NOT the MichelinPS4S; the PS4 does not target the same cars as the PS4S, which is the intended replacement for the PSS (although it does not yet exist in all sizes, so the MPSS is still available and needed for some cars).
The PS4 is the successor of the PS3 while the PS4S is the successor of the PSS.

 

Thanks very much for all the posts. So can I fit Michelin Cup 2 R tires on standard 458 without replacing the wheels?

 

Yes. Image Unavailable, Please Login

 

Yes you can fit them, but it won't work. The diameter of the rears are so far off from the OE that you will have issues with the ABS and TC. Many have tried, and many have failed. It was a no-go when the Speciale was released, still is
Do you track your car?

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Aside from the fact that the size will not work, a stock 458 is not set up to handle an R compound tyre with a stiff sidewall. Many also tried with Trofeo R and they found that you needed to change the geometry - which by the way in stock form, is borderline ridiculous for a performance car.

If you want to run R compound, here's a suggestion a few track rats in my region has had success with.

Install Speciale springs - they are fairly cheap.
Lower the car 20mm
Set your front camber between 1.8 to 2.0 neg. on each wheel.
Stock rear settings.
Set front toe in to 1 degree. This will remove the dartyness and make it much more precise and calm.
Again, retain stock rear toe in.

In this configuration, your car can handle a grippy tyre without scuffing or skipping, and you can install Trofeo R in 245/35R20 and 295/35R20.

If you do not feel like changing your setup, or don't track, try Bridgestone S007A in 245/35R20 and 305/35R20. If you don't track, forget the MPSC2 and Trofeo. They are grippy yes, but they need to be warm to grip. In most road conditions, an MPS4S or the S007 will grip much more - and last a hell of a lot longer.

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