I ditched the RF's on my previous X5 with 3rd row and just kept a can of fix-a-flat in the boot cubby. Luckily we never had a flat even with crap Michigan roads. Much cheaper and quieter. My new X5 is not 3rd row and has a spare. Currently the as purchased tires are big $$$ Michelin's but I plan to downgrade when the time comes. We ran Mastercraft Courser's on the old X5 and they were great.