A machine, apparatus and method for testing tires with increased accuracy and reliability is disclosed. A flat belt tire tester employs a wheel and tire to be tested about an axis, whereby the tire is positioned above and upon the surface of a flat belt. A spindle and/or spindle extension is used for calibrating the machine, and forces are applied in a mechanical couple, providing a resulting force that is acceptable for calibration purposes. Once calibrated, the machine is capable of more reliably testing tires with accurate results. A numerical matrix is constructed by taking force measurements along each axis in a three axis system (X, Y and Z axes). An apparatus for reliably calibrating the machine and correcting for slight deviations (i.e., errors) in transducer readings by constructing an accurate matrix of correction factors is disclosed.
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