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My 128i vert with ZSP has the same suspension as the 135i and I've never noticed the suspension bottoming - whether on the original RFTs or the replacement DWS tires. While non RFTs give a softer ride because of the sidewall stiffness, they don't alter either damping or spring rates.
So if you really have only one inch of suspension travel, perhaps the car was not prepped properly for initial delivery. I'd have it looked at.
Tom
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