Continental Extreme Contacts have the softer sidewalls you are looking for. They are also a quiet tire. The tread rating is still hard enough that the tires last longer than most. You will have more rollover so turn in will be compromised a little but they are an option to consider if they make the size you want. The pricing is lower as it relates to other premium brands. They are directional.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas