355 - Tires: why 40 profile front and rear? | FerrariChat

355 Tires: why 40 profile front and rear?

Discussion in '348/355' started by M@r]{, May 25, 2022.

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  1. M@r]{

    M@r]{ Rookie

    Aug 16, 2019
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    Mark Nash
    #1 M@r]{, May 25, 2022
    Standard tires 225/40/18 at the front, 265/40/18 at the rear. As most will know, the profile is a percentage of the width, therefore the profile is larger on the rear compared to the front? Any ideas why?

    I ask as there seems to be a great selection of tyres of size 265/35/18 and was thinking of going that route?

    Any thoughts?
     
  2. ChoonHound

    ChoonHound Formula 3
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    #2 ChoonHound, May 25, 2022
    Rear wheel drive plus mid rear-mid-engined dictates more meat in the rear than that front. Also, in 1995 a 40 series tire was considered extremely low profile.
     
    Mike Morrissey likes this.
  3. Ferrarium

    Ferrarium F1 Veteran
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    #3 Ferrarium, May 27, 2022
    265/35/18 is an inch shorter, will be lots of gap.
     
  4. ChoonHound

    ChoonHound Formula 3
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    #4 ChoonHound, May 27, 2022
    It’ll also screw up your gearing and speedometer.
     
  5. Ferrarium

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    #5 Ferrarium, May 27, 2022
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  6. spaghetti_jet

    spaghetti_jet Formula Junior

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    #6 spaghetti_jet, May 28, 2022
    as was mentioned above, in 1994 a 40 profile was almost as low as you could go with commercially available tyres and 18” was considered huge.
     
  7. Mitch Alsup

    Mitch Alsup F1 Veteran

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    #7 Mitch Alsup, May 29, 2022
    The greater the profile (measured in inches) the greater the pothole dent resistance.
     
    IvanRico likes this.

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