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SSR Wheels (formerly known as Speed Star Racing Wheels) is a Japanese wheel manufacturer for both motorsport and aftermarket applications, headquartered in Osaka, Japan. The company is often credited as being the first to ever make a three-piece wheel with their MK-I wheel in 1971, and remains one of the most notable Japanese producers of ...
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An axlebox, also known as a journal box in North America, is the mechanical subassembly on each end of the axles under a railway wagon, coach or locomotive; it contains bearings and thus transfers the wagon, coach or locomotive weight to the wheels and rails; the bearing design is typically oil-bathed plain bearings on older rolling stock, or roller bearings on newer rolling stock.
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.
Forged wheels are usually lighter, stronger, but much more expensive than cast wheels. There are two types of forged wheels: one piece and modular. Modular forged wheels may feature two- or three-piece design. Typical multi-piece wheels consist of the inner rim base, outer rim lip and wheel center piece with openings for lug nuts.
For an asymmetric wheel such as a front wheel with disc brake or a rear wheel with chain derailleur, the value of d is different for the left and right sides. a is the angle between (1) the radius to a nipple hole in the rim to which a spoke is attached, and, (2) the radius to the flange hole holding the spoke.
The wheel rims are usually steel or aluminum (generally with steel spokes and an aluminum hub) or mag-type cast or machined aluminum. Cast magnesium disks, produced by one-step hot forging from magnesium alloys ZK60 and MA-14, are also used for many motorcycle wheels.
BBS continues to produce one-, two-, and three-piece forged wheels out of aluminum and magnesium alloys, as well as high performance flow-formed wheels and low-pressure cast wheels. [20] BBS also actively uses specialized quality and weight optimization methods, such as CNC back-milled spokes , x-ray inspection , FEM analysis, flow-forming ...