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9 Have the driver stand with his back to you holding his arms out at approximately a 30-degree angle. Place the tape measure 1.5 inches below the armpit and measure the width of the back in a horizontal line. Remember, for all of these measurements, make sure the driver isn’t flexing, making muscles or otherwise puffing themselves up to look cool. It may be good for the driver’s ego, but it’sn’t when it comes to getting the best possible fit for a racing seat.