Nitrogen is an unnecessary expense if you check your tire pressure regularly.
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It's worth emphasizing that the stopping distance comparison that Tire Rack did was in wet conditions only. They didn't test in the dry. They also artificially "aged" the shaved tires by baking them in an industrial oven for several weeks.
So the idea that
dry traction may be unaffected (or even improved) by reduced tread depth still holds.
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Tread is often unnecessary, but essential to safety some of the time.
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No argument there. Just clarifying their test.