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I've got the Alenza RFTs on our 2022 X5 and Michelin PSS (summer, non-RFT) on my 2023 Z4. Driving around Florida on our lousy roads, there's not a lot of difference in noise. On freshly paved asphalt, they're both pretty quiet. On the rougher sections where the asphalt or concrete is breaking down, they are both noisy.
My experience going to non-RFT on earlier X5s was a bit of improvement in ride due to the more compliant sidewall. Noise is primarily driven by the tread design and how hard the tire compound is. TireRack's surveys can tell you a bit about what to expect, but I find tire noise to be highly subjective.
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2023 Z4 ///M40i Thundernight Metallic/Cognac Vernasca/Moonlight/Shadowline/19" Black 799M/PP/DAP/ACC/HK
2022 X5 xDrive40i Phytonic Blue/Cognac Vernasca/DAPP/LSP/PP/CCP/PAP/20" Style 738/Spare Tire/Trailer Hitch
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