I have newer generation Bridgestone RFTs (255/50/19) and I was told since they are newer generation they aren't that stiff but boy are they stiff or are they stiff. You can feel a bump even if you pass a 1" patch.

And I do Ultra94, which gets me about 480km per tank with these tires on.

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2008 Alpine White X5 3.0si
AG Sports Package
Premium Package
Technology Package
Winter Package
Comfort Access