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The hub assembly is located between the brake drums or discs and the drive axle. A wheel is bolted on it. Depending on the construction, the end of the hub comes equipped with the splined teeth. They mate the teeth on the axle shaft. The axle hub spins along with the wheels bolted to it and provide power to the wheels in order to rotate.
MTB rear spacing is normally 135 mm OLD. Another advantage of the Shimano cassette hubs introduced from 1978 was that the rear hub flanges were wider apart than those of a threaded hub, so built a stronger wheel with less dish and without the problem of increased bearing stress or axle failure.
The overall assembly can carry more weight than a semi-floating or non-floating axle assembly because the hubs have two bearings riding on a fixed spindle. A full-floating axle can be identified by a protruding hub to which the axle shaft flange is bolted. The semi-floating axle setup is commonly used on half-ton and lighter 4×4 trucks in the ...
Identification between the two can be made by examining the hub: the protrusion of the hub through the center of the wheel denotes the preferred 10.5-inch full-floating rear axle. While the 9.5-inch rear end exhibits its own durability, it is generally considered less favorable for high-torque applications.
On March 23, 1895, John Lincoln Scott, a farmer and carpenter from Wilmot, Indiana applied for a patent from the United States Patent Office for his invention of a roller bearing that fit on "the axle-skeins and hubs of wagons, buggies, or other wheeled vehicles". [1]
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.
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