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Our narrow tandem tires cut into the dust and bounce and slide from one auto-tire slickened rock to another. We hope to avoid the shattered and sharpened hidden ones, capable of ruining our day, and one of our tires. We have one spare, and wonder if we should not have brought two. A few times a particularly viscous rock (by the second day I was attributing evil intent to certain rocks) would throw the front wheel toward the abyss, necessitating a dual bail out.
