Wheel studs are the threaded fasteners that hold the rims on a vehicle. The wheels stud size show the diameter of stud that fits trough the hole of the rim.
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The number of bolt holes shows the number of bolt holes with which the rim can be fixed.
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The ET value of a rim indicates its convexity. This is how far the rim is inside or outside the wheel arches. The ET value is also better known as offset value.
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Rims are usually made of aluminium or steel.
- Steel rims are usually sturdier and can better withstand the salt that is spread in the winter. Steel rims are heavier, however, which means that less cargo can be transported.
- Aluminium wheels do not rust and retain their shine longer. Well-lubricated rims such as Alcoa's are generally stronger than steel rims. In addition, aluminium rims are lighter, which means that more cargo can be transported.