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Alignment Needed?

Discussion in 'FX (03-08) - Wheels & Suspension' started by puhahacj, Feb 14, 2008.

  1. After the 20" OEM wheels upgrade from 18", I noticed the car slows down dramatically when rolling in neutral compared to when I had the 18"s. Are alignment specs setup different from the factory for the 20" vs 18" wheels? If so, f'ing alignment costs $100!!!!

    Any opinions? Am I just paranoid? Or do I really need the alignment service?

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  2. Mongolian

    Mongolian Premium Member Premium

    I really don't see the need for an alignment just because of wheel size change. Maybe you ran over something and something else other than the change in wheel size is causing your problem?

    $100 for an alignment is a bit high. I think I pay $80.
  3. fxlr8

    fxlr8 Staff Administrator

    you should not need an alignment from a wheel change. When you let go of the steering wheel does it go straight? Did you have any other work done when you changed the tires? Brakes...stuff like that?
  4. brown_fv

    brown_fv Premium Member Premium

    changing the wheels shouldn't make a difference. going from the 18s to 20s are the same radius anyways.
  5. OP

    puhahacj Member


    the 20"s are slightly bigger, maybe less than 0.5" I'm just being paranoid, the cup was being half empty.

    Damn So. Cali rain, car is so f'ing dirty.
  6. brown_fv

    brown_fv Premium Member Premium

    actually believe it or not, the stock 18's with stock tires are bigger than the 20s with tires .

    18s -
    Radius: 387.6mm
    Diameter: 775.2mm
    Circumference: 2435.4mm

    20s -
    Radius: 386.5mm
    Diameter: 773.0mm
    Circumference: 2428.5mm
  7. I don't think 2.2 mm will make any difference at all. That's 1/11" or a .28% difference. There is a bigger difference in diameters between different brands of tires labeled as the same size than that. According to the Miata tire calculator, the 60 series will have 661 revolutions per mile and the 50 series will have 663 revolutions per mile. That boils down to no difference in actual use. The change you made in your wheels should have no affect on your alignment.
  8. OP

    puhahacj Member

    Alignment fixed! Way out of spec on toe. Rides smooth now.
  9. OP

    puhahacj Member

    Hey guys, do your tires wear on the front inside or wears evenly almost flat? I just checked my tread and the inside of the tires on the fronts are VERY smooth.
  10. I just noticed this too on mine. I didnt notice when i bought it but i will certainly haveto replace two of them by year end.
  11. jumbosrule

    jumbosrule Premium Member Premium

    Redondo Beach, CA
    2003 FX35T
    The Goodyear RSAs generally wore out evenly flat across the tire. Just before spring installation my alignment was out and my tires were wearing on the insides.

    After 3 months I did another alignment and rotated the tires. I do not see any uneven wear, but I'm watching...