Westwood rim as fitted to vintage roadster bicycles with rod/ stirrup brakes, today being used in contemporary “drum brake” traditional utility bicycles
Endrick Rim Front Rim as fitted to sports bicycles from the 1930s, 40s and 50s, forerunner of modern day rim brake rims.
Rear Rim for tubular tires, referred to "sprint rims" in Britain.
The rim is commonly a metal extrusion that 26 Bicycle Rims is butted into itself to form a hoop, though may also be a structure of carbon fiber composite, and was historically 26 Bicycle Rims made of wood. Some wheels use both an aerodynamic carbon hoop bonded to an aluminum 26 Bicycle Rims on which to mount conventional bicycle tires.
Metallic bicycle rims are now normally made of aluminium alloy, although until the 1980s most 29er Rims - with the exception of those used on racing bicycles - were made of steel[5] and thermoplastic.
Rims designed for use with rim brakes provide a smooth parallel braking surface, while rims meant for use with disc brakes or hub brakes sometimes lack this surface.
The Westwood pattern Rear Rims was one of the first rim designs, and rod-actuated brakes, which press against the inside surface of the rim were designed for this Front Rims. These rims cannot be used with caliper rim brakes.
The cross-section of a BMX Rims can have a wide range of geometry, each optimized for particular performance goals. Aerodynamics, mass and inertia, stiffness, durability, tubeless tire MTB Rims compatibility, brake compatibility, and cost are all considerations. If the part of the cross-section of the rim is hollow where the spokes attached, as in the Sprint rim pictured, it is described as box-section or double-wall to distinguish it from single-wall rims such as the Westwood rim pictured. The double wall can make the rim stiffer. Triple-wall rims have additional reinforcement inside the box-section.
Aluminum rims are often reinforced with either single eyelets or double eyelets to distribute the stress of the spoke. A single eyelet reinforces the spoke hole much like a hollow rivet. A double eyelet is a cup that is riveted into both walls of a double-walled rim.

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