I have the General Altimax HPs on my X as well in 17" size. I LOVE it. Ride is incredibly quiet, smooth and handling is great. I can't believe how it handles rain - you literally feel like you're still on dry pavement. I've had them on for 5K miles now.

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2006 X5 3.0L - Schwarz Black/Truffle Brown
Stock
But I keep it clean