Quote:
Originally Posted by v3.0si
no criticism from me. the 269 is a beautiful wheel!
you mentioned that the tires will be an inch taller... remember that will effectively change your overall gearing and will cause slower accelleration. it will also change your speedo, tach, odometer, and fuel economy.
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Actually, the 269 rims are lighter than my current rims and are certainly lighter than any normal rim that is made for the Z4 in 18". Coming from this, I would expect either no change or a slight improvement since the weight that the engine has to turn, i.e. rims and tires, is lower. Furthermore, the speedo will not change because the larger diameter rim requires a lower tire side wall (17" 225/45 front now, 18" 225/40 front with new rims). I've put it through a calculator that determines the difference in size between old and new sizes and thus the deviation from the speedo and in that particular case it showed that the speed difference at 100km/h will be +0.1km/h for the new tire size, which is pretty negligible.