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328 wider rear tires

Discussion in 'Technical Q&A' started by oporto328, Nov 28, 2003.

  1. oporto328

    oporto328 Karting

    Sep 3, 2002
    82
    Oporto - Portugal
    Full Name:
    André Ferreira Costa
    Would like to know if someone has used in a 328 245 wide rear tires leaving 205 in front. I'm thinking on this mod since i have the (wrong?) idea that the steering in front with 225 will become too heavy. This mod is in great part because it's good to have a little more rear grip and the rear view becomes more agressive.
    What sort of change in handling would I feel (with 205/245)?
    What about performances? That is another (wrong?) idea that I have. Puting larger tires the car will be a little slower. Is this true?
    Thank you.
    André Costa
     
  2. f355spider

    f355spider F1 World Champ
    Rossa Subscribed Owner

    May 29, 2001
    16,553
    USA
    Full Name:
    Hugh G. Rection
    I have put 225/50/16 front and 245/45/16 rear on a 308 and it did not make the steering excessively heavy. Only really noticed it while parking, at low speeds.

    Just changing the rears will likely cause the car to understeer more...it is best to keep the ratio in sizes between front and rear closer to what the factory has specified...which is two sizes in width apart.
     
  3. Dave

    Dave F1 Rookie

    Apr 15, 2001
    2,722
    Little Rock
    Full Name:
    David Jones
    André, I run 225 front and 245 rear...
    Using the wider tires up front will feel different because of the larger contact area, but I don't feel that the steering is excessively heavy.
    One of the biggest changes you can make to help the situation is to have an alignment done after the tires are balanced and installed.
     
  4. Darolls

    Darolls F1 Veteran
    BANNED

    Jul 2, 2003
    6,799
    Full Name:
    Sparky
    If you're going to 245X45 rears, change the fronts to 225X50.
     
  5. hardtop

    hardtop F1 World Champ

    Jan 31, 2002
    11,211
    Colorado
    Full Name:
    Dave
    Andre,
    I have 17 inch wheels on mine with 225's front and 245's rear. I think 205's and 245's probably is a bad idea. Having said that, I am considering going to 215's up front with 245's on another set of wheels and use 225's front and 255's rear for track driving. I have noticed a trend lately with ever wider rears and narrow fronts. The reason I'm considering this is the new 17X8 wheels with 225's up front feel heavier and bouncier in normal driving. The 225's and 245's are much grippier than stock but I want to see if the 215's would be a better compromise. Unfortunately, if you want 215's with 16 inch wheels you need 215/50's which is an odd size (also used on 348's) with very limited tire choice.

    Dave
     

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