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Phillip writes: “This is a really cool ‘why didn’t I think of that?’ tool.  It’s available from Summit Racing.  Looks like it would be useful for many applications besides racing.”

These are used most often by drag racers, who manipulate tire pressure in miniscule amounts to control traction.  Of course, since they don’t turn — at least not on purpose — they definitely want both tires with equal pressure.  These are used by road racers from time to time as well, but not by circle track guys.

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