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The Chevy HHR has a wheel bolt pattern of 5 X110mm, which means it requires 5 lug nuts to attach the wheels with a diameter of 110 mm. Chevy recommends tightening the nuts to a torque of 100 ft-lbs. The "hex" pertains to the top diameter of the lug nut, important when changing rims, while the shaft diameter is crucial for proper fitting. Thread size, indicating the shaft size and groove spacing, for the HHR is 19 mm hex and a thread size of M12 X1.5.
The specified torque for the lug nuts on a Chevy HHR is 100 foot-pounds.