The Porsche wheels supplied as original equipment are designed for tubeless, radial-ply tires of a specific size. Replacement tires of non-standard size or construction should be installed only if the tire manufacturer specifies them for your specific make and model.
The wheels are sized according to diameter and width. When fitting a non-standard wheel with different dimensions, there is danger of wheels or tires interfering with the body or with suspension parts. Even if there is no interference, incorrectly sized wheels may place additional loading on wheel bearings or adversely affect steering geometry. For best results, rely on the advice of your Porsche dealer or reputable wheel and tire professionals.
Wheel lug bolts should always be tightened using Porsche special tool P 300 (19 mm socket) and a torque wrench. Too little torque is obviously dangerous as the wheel may come loose, but excessive torque is also a problem. Over-tight wheel lug bolts can warp the hub, causing vibration and other problems affecting stability and braking.
^ Damaged wheels may also be a source of vibration problems. Alloy wheels are constructed of a soft aluminum-mag-nesium alloy and can be easily damaged.
Check for a bent wheel by measuring lateral or radial runout at the part of the wheel where the tire bead meets the wheel.
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