Which Way to Loosen Tire Bolts?

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For passenger cars, it's left to loosen and right to tighten. For large trucks, the left-side tires are left to tighten and right to loosen, while the right-side tires are right to tighten and left to loosen. Below is the relevant information: 1. Direction of tire bolts: For passenger cars, tire bolts loosen counterclockwise. For large trucks, the left and right sides differ—the left side (driver's side) has reverse threads, while the right side has standard threads. This means tightening follows the vehicle's forward rolling direction, while loosening follows the reverse direction. 2. Wheel hub bolts: Wheel hub bolts are high-strength bolts that connect the wheels to the vehicle. They attach to the wheel hub unit bearings. Typically, compact cars use 10.9-grade bolts, while medium and large vehicles use 12.9-grade bolts.