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2. Bottom bracket - Wikipedia

   en.wikipedia.org/wiki/Bottom_bracket

   Bearing cups are pressed into the bottom bracket shell. The crank holds the cones, facing in; adjustment is made via the left-threaded non-drive side cone. One-piece cranks are easily maintained and reliable, but heavy. They are found on BMX bikes as well as children's bicycles and low-end road and mountain bikes.

3. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Cone: holds bearings in place, pressed against the cup; Cotter: pin for attaching cottered cranks; Coupler: to connect tubing together; Crankset or chainset: composed of cranks and at least one chainring; Cup: receives ball bearings which roll along its inner surface; integrated on most conventional hubs or can be pressed into older bottom ...

4. Crankset - Wikipedia

   en.wikipedia.org/wiki/Crankset

   Cranks are constructed of either an aluminum alloy, titanium, carbon fiber, chromoly steel, or some less expensive steel.Tubular steel cranks (such as Tioga's Revolver) can be light and very strong, are usually found on BMX bikes, and are slowly finding their way to mountain bikes (dirt jumping and urban assault).

5. Bicycle pedal - Wikipedia

   en.wikipedia.org/wiki/Bicycle_pedal

   Bicycle pedal, quill road type, with toe clip and toe strap (1970s) The quill pedal is a common pedal system on bicycles. It consists of a main axle section that is attached to the bicycle crank arm and contains extensions from the axle to which parallel cage plates are attached at the front and rear of the pedal.

6. Headset (bicycle part) - Wikipedia

   en.wikipedia.org/wiki/Headset_(bicycle_part)

   Then the bearings are placed on top of the crown race, after which the steerer tube is inserted into the headtube. The upper bearings are placed in the upper cup, and the upper race is screwed onto the steerer. A washer, frequently a keyed washer, is placed on top of the upper race and a locknut is screwed on top of that.

7. Main bearing - Wikipedia

   en.wikipedia.org/wiki/Main_bearing

   The number of main bearings is primarily determined by the overall load factor and maximum engine speed. [1] Increasing the number of bearings in an engine will generally increase the size and cost of the engine, but also reduces bending stress and deflection caused by the distance from the crank pins to the nearest bearings.