458 - Tire Options Size | Page 2 | FerrariChat

458 Tire Options Size

Discussion in '458 Italia/488/F8' started by Joff Clarke, Feb 25, 2020.

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  1. Whan

    Whan Rookie

    Sep 4, 2020
    45
    Marin, CA
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    Will
    Awesome, thanks for the suggestion!
     
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  2. Whan

    Whan Rookie

    Sep 4, 2020
    45
    Marin, CA
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    Will
    Update: Randomly found someone locally selling a set of 20x9 ET44.7 and 20x11 ET48.4 forged aftermarket wheels that were the same model as my current 21/22s. Think these appear to be exactly Speciale spec sizes and offset. I'm hoping I can fit the 255/35/20 upfront without rubbing, given the less aggressive offset (by 5.7mm) vs. my current front wheel
     
  3. Bluem5

    Bluem5 Rookie

    May 31, 2020
    20
    Thanks for sharing the info with me really appreciate it I guess the tyre shop didn’t know too much technically and wanted to upsell me the tyres. I m now 1.5 months in and hardly drive it. Put no more than 300 kms on it. Should I change back to the 295 factory spec? And sell off the 305 at a loss?
     
  4. Il Co-Pilota

    Il Co-Pilota F1 Veteran

    May 29, 2019
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    A.B
    I would personally do the other thing.

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  5. Il Co-Pilota

    Il Co-Pilota F1 Veteran

    May 29, 2019
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    A.B
    I think you should. It's far from an optimum situation.

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  6. Bluem5

    Bluem5 Rookie

    May 31, 2020
    20
    Thanks for the input once again.
    Would the situation be potentially dangerous only in wet situations or could something go wrong in dry conditions as well ?

    or would driving in dry CT mode be safer than sport or race in order for it not to intervene the way it does ?

    TIA
     
  7. Need4Spd

    Need4Spd F1 Veteran

    Feb 24, 2007
    6,644
    Silicon Valley
    Once you depart from the factory recommended sizes, it’s hard to predict. The SSC (side slip control) has very complex parameters. Unless you have a “very sensitive butt” like Niki Lauda did, you may not find out until too late. I am tempted to try the slightly upsized fronts (the Lusso spec), but even then, not sure.


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  8. Il Co-Pilota

    Il Co-Pilota F1 Veteran

    May 29, 2019
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    Like N4S says, once you depart so much from the factory front to rear bias, it's a total unknown. You can easily upsize as long as you stay within some safe parameters regarding front to rear wheel speed.

    The fact that your car is trying to apply brake force to your wheels, is a very clear indication that this is a bad situation.

    You might get away with it in CT-Off, but what happens when you find yourself in a situation where you need Sport or Wet? You might find yourself in a situation where you have to drive on getting caught in the rain. Imagine driving along and one or both rear brakes suddenly being applied.

    Doing the Lusso size is well within what the system can accommodate for. It is not a bigger difference than could be found because of wear. But your situation is FAR beyond what the system was ever designed to work with, and when you see what goes on in Sport that's a clear indicator of this. So in short, yes it is potentially dangerous.
     
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  9. Bluem5

    Bluem5 Rookie

    May 31, 2020
    20
    Thanks so much for your inputs gents
    Appreciate it a lot, I ll find time to get the tyres swapped out.

    If in any case should I keep the 305 s for the odd track day ? Or just get rid of it?
     
  10. Whan

    Whan Rookie

    Sep 4, 2020
    45
    Marin, CA
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    Will
    I'd sell it? Seems like something of a hassle to mount/balance a different set of tires to wheels for a track day, and then unmount them afterwards
     
  11. Need4Spd

    Need4Spd F1 Veteran

    Feb 24, 2007
    6,644
    Silicon Valley
    Sell them. 305/30-20 is OEM size for a number of Porsches.


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  12. Il Co-Pilota

    Il Co-Pilota F1 Veteran

    May 29, 2019
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    A.B
    Just sell them.
    Even in CT off on track they might be a problem. As was said, lots of cars running that size.

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  13. matt lane

    matt lane Rookie

    Jul 17, 2007
    41
    Canada
    Full Name:
    Matthew Lane
    I will be due for new tires this summer season, started to do some research. In 458 stock sizes, the Michelins are a no-brainer.

    I did however look into a nominal upsize to 245/305 maintaining the same 35 aspect ratio. That opens up the option of the Conti Extreme Contact tire - these are ostensibly 'copies' of a Michelin Super Sport, and very good indeed. I have them on my 993 and they are great street tires.

    In Fcar fitment, they are about $200 less a set than the Michelin. Assuming those prices hold in summer, I'll probably go that way.

    Cheers

    Matt
     
  14. 458 Spider 0414

    458 Spider 0414 Formula Junior
    Owner Rossa Subscribed

    Dec 7, 2017
    493
    MIAMI, FLORIDA
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    RAY
    Question for Co-Pilota,
    You give great information and advise.. So, is the below tire size’s ok to use? Will there be any issues with braking and speed? Safety?
    I too, like others who own a 458 would like the wider rear tires.

    Would like to use:
    245/35/20 MPS4S
    305/35/20 MPS4S

    Currently, on the 458 Spider:
    235/35/20 MPS4S
    295/35/20 MPS4S

    I appreciate your input.
    Ray,
     
  15. Melvok

    Melvok F1 World Champ
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    Jul 25, 2008
    14,101
    Amersfoort, The Netherlands, Europe.
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    Mel
    My '12 Italia is not lowered and I drive already for years with MPS 305's on the back: not ever a problem, also not on the track ! Image Unavailable, Please Login
     
  16. Il Co-Pilota

    Il Co-Pilota F1 Veteran

    May 29, 2019
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    Zero issues Ray. Will work well and look good doing it.

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  17. Il Co-Pilota

    Il Co-Pilota F1 Veteran

    May 29, 2019
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    He was asking about 305/35R20.

    What are you running on the front?

    If stock fronts or 245/35 and you don't have any issues with ABS or TC when in Sport or Wet. Then you are the only one I have ever heard of.
    It is definitely not normal that the Speciale size combo works without issue on a 458. If your fronts are 245/30R20, then I can understand, but if 245/35R20 and zero issues in any mode, that's very unusual for a 458 with no ECU/ESC programming mods.

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  18. Melvok

    Melvok F1 World Champ
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    Jul 25, 2008
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    I have stock 235/35 in front …

    This setup works super with me …

    305/35R20 seems wrong to me ...
     
  19. Il Co-Pilota

    Il Co-Pilota F1 Veteran

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    305(35R20 is much closer to OE than 305/30R20. 305/35R20 is 28.4" in diameter, so 0.3" more than stock as 295/35R20 is 28.1". The 305/30R20 is 27.2" so almost a full inch smaller in diameter, hence why people usually also have all sorts of issues with the ABS, especially when using 245 fronts which offset the difference in the wrong direction even more. It also lowers the rear 0.45" compared to the front which has a significant effect on the overall balance of the car, and also reduces the diffusers effect. Lastly it opens up the rear arch gap another 12 mm which makes the already huge wheel arch gap on the 458 seem even more massive.

    So from several standpoints, the 305/35R20 is definitely a more "natural" choice. It is so close with its 0.15" radius that you would probably need a 458 with OE tyres sitting next to it to tell the difference. What you gain by going to 245/35R20 and 305/35R20 is primarily width, and very little actual tyre wall height. We're talking about 3.5mm of tyre wall height difference compared to stock. With the 305/30R20 you lose 11.5 mm tyre wall which is added to the arch gap.
     
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  20. 458 Spider 0414

    458 Spider 0414 Formula Junior
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    Dec 7, 2017
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  21. Il Co-Pilota

    Il Co-Pilota F1 Veteran

    May 29, 2019
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    In that case you can use the full Lusso set.

    MPS4S in:

    245/35R20 K1
    295/35R20 K1

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  22. ajc

    ajc Rookie

    Aug 8, 2005
    36
    uk
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    AJC
    Thanks for all the info I am looking at the ps4s 305/35 and 245/35 set up as suggested.

    The question is the 245 is available as K1 ferrari but the 305 is not.

    What should I go for the K1 and what other or all 4 in which set up e.g porshe, mercedes generic as I would like to keep this size tyre in ps4s (has a ps4s and pss at the moment hence the change)

    Hope this makes sense and appreciate any advice on this.
     
  23. Melvok

    Melvok F1 World Champ
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    Jul 25, 2008
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    I think that is correct.

    Is 245 instead 235 not giving issues ?
     
  24. Il Co-Pilota

    Il Co-Pilota F1 Veteran

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    No issues.

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  25. Il Co-Pilota

    Il Co-Pilota F1 Veteran

    May 29, 2019
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    If using the 305/35R20 in the rear, I'd use a non-OE 245 front. The non-OE tyres are usually a bit more neutral, and that is something the 458 can take advantage of.

    It is important to stress that the K marking does in no way mean better quality or "For all Ferrari modeks". They are model soecific, and there are no such thing as a Ferrari compound or the like. If you decide to use a K, then go K1. The K2 is the Porto tyre and have a very narrow tread, so completely wrong for what you are doing.

    But in this case, I'd go non-OE on both axles.

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