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The 2001 Chevy Tracker has a wheel bolt pattern of 5 X 5.5 inches, which means it uses 5 lug nuts that secure a diameter of 5.5 inches. This pattern can also be noted as 5 X 139.7 mm. In this case, "MM" stands for millimeters, as most wheel bolts or nuts are sized and ordered in the metric system. The "hex" refers to the top diameter of the lug nut, with the shaft diameter being more crucial for proper fit when changing rims. Thread size indicates the shaft size and the space between the grooves or "threads". For the Chevy Tracker, the hex size is 13/16 inches and the thread size is M12-1.50.
The 2001 Chevy Tracker features a bolt pattern of 5x5.5.