Quote:
Originally Posted by CzaK
Not sure. Was done at BMW dealership along with the tires.
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Just because the BMW dealer dis it doesn't automatically guarantee its right.
But I will say this. Tramlining as you described are usually the result of having wide, low profile tires. For example, I just swapped for tires that are only 10mm wider than stock on my Fiat 500e and the amount of additional tramlining compared to the original 185mm wide tires is very evident.
Then I drive my MZ4 Coupe with the 3.5 degree camber, 275mm wide, low profile tires, and at anything approaching land in jail speeds you'd think the steering has a mind of its own.
Years ago before BMW started putting runflats on, I swapped out the stock 225 tires on the OE 17" rims to 245 tires on 18" all around on my 323ci, and the same thing, was shocked to find that the car follows every little bump, contour, nook, and cranny of the road.
IF you're simply comparing the Z4 to the Mazda, it's likely the Mazda has higher profile tires that were narrower, riding on a double wishbone/multilink type suspension up front, while the Z4 rides on MacStrut design, with wider and lower profile tires, ALL factors that contribute to increase the effect of tramlining.
There are things you can do to minimize. Reduce front tire camber, increase front toe-in. But it will likely NEVER get ride of all the tramlining behavior due to the inherent stiffer sidewalks of a wider, lower profile tire.