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    Real effects: 18" vs 19" wheels

    Maybe old revisited question. Can't find the info. Need some help, going to change to light weight Al-wheels for my upcoming '07 turbo. Want to consider 18" over factory 19" because of a more comfortable ride. At least that is the case with my M3 going from 19" to 18". Most European mags recommend 18" over 19" for a softer ride over US-roads. They say roads are a bit smoother in UK, Germany, etc, is reason 19" have become popular.
    On the track, I would think less side to side motion would be present with 19" vs 18" because of less air. But 18" are recommended for track so this may not be an issue. Is this true?? Some say the only plus from 19" is a better look for the car. Is this the only benefit from 19" over 18" wheels??

    Re: Real effects: 18" vs 19" wheels

    traction in perfect tramac is better for 19, but if the surface isn't that good it will be worse.
    plus 19 are heavier, and that weight will be "graged around" by the suspension!

    Re: Real effects: 18" vs 19" wheels

    Also, you have less sidewall flex available with 19" as compared to 18", so tyre blowouts under hard driving might be a possibility. There was a nice thread on Rennlist a few years back so you might want to check there.

     
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