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A threaded brass hubcap on a cart wheel with artillery style hub Various automobile hubcaps. A hubcap or hub cap is a decorative disk on an automobile wheel that covers at minimum the central portion of the wheel, called the hub. [1] An automobile hubcap is used to cover the wheel hub and the wheel fasteners to reduce the accumulation of dirt ...
These consist of a shaft at the hub, with an external screw thread, a straight external spline section and a tapered interface at the hub base. The wheel centers have internal splines and a matching taper to align and center them on the hub. The wheels are fastened to the hub by means of a winged, threaded nut, called a "knock-off" or "spinner."
The hub is the center of the wheel, and typically houses a bearing, and is where the spokes meet. A hubless wheel (also known as a rim-rider or centerless wheel) is a type of wheel with no center hub. More specifically, the hub is actually almost as big as the wheel itself. The axle is hollow, following the wheel at very close tolerances.
The disk is welded in place such that the center of the wheel is equal to the center of the hub. The distance between the centerline of the rim and the mounting plane of the wheel is called the "offset" and can be positive, negative, or zero. [14] One-piece rim and wheel assemblies (see image) may be obtained by casting or forging.
In contrast, steel wheels are usually pressed from sheet metal, and then welded together (often leaving unsightly bumps) and must be painted to avoid corrosion and/or hidden with wheel covers/hub caps. Alloy wheels are prone to galvanic corrosion, which can cause the tires to leak air if appropriate preventive measures are not taken. Also ...
The centerbore of a wheel is the hole in the center of the wheel that centers it over the mounting hub of the car. Some factory wheels have a centerbore that matches exactly with the hub to reduce vibration by keeping the wheel centered. Wheels with the correct centerbore for the car they will be mounted on are known as hubcentric.