Most Porsches use a reverse lug. The lug actually threads into the rotor, as opposed to a nut threading onto bolts mounted on the rotor. Some Porsches do use the standard lug and nut set-up. You should always use the proper tools for removing and installing wheels on the vehicle to prevent potential damage to the rotors and wheels. Proper torque for the bolts is important.
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All Porsche models use the same torque for the wheel bolts. The lugs need to be torqued to 95 foot-pounds of pressure. Using a torque wrench will ensure that the bolts are not overly tightened. The vehicles use hub-centric rims, which centre the rim on the hub. You can torque hub-centric rims while the vehicle is in the air or on the ground. The bolts are tapered, allowing for a solid fit within the wheel.
Wheel Installation Tips
Installing the wheel can be difficult since the vehicle does not have mounted lugs. The best way to install the wheels is to engage the brake. Have someone step on the brake. Raise the tire so that the centre hub on the rotor catches the centre hole on the rim. Press the tire against the rotor, and slowly spin the wheel. You will see the holes in the rotor quickly, and be able to insert the lugs properly. Hand-tighten all the lugs. Most Porsches use special attachments to bolt and unbolt the lugs. Use the tool to securely tighten the lugs before torquing them.
Proper Torque Patterns
Most Porsches use a five-lug set-up. To properly torque a wheel, you should apply the torque while the wheel is in the air and as someone presses the brake. Attach the specialised tool to the head of the torque wrench, after you have hand-tightened the lugs. Slowly tighten the first bolt until the torque wrench clicks. Tighten the bolt opposite the first one, and continue in a star pattern. The star pattern ensures the wheel is properly seated on the hub.
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