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2. Gear - Wikipedia

   en.wikipedia.org/wiki/Gear

   Plastic gears may even be intentionally designed to be the weakest part in a mechanism, so that in case of jamming they will fail first and thus avoid damage to more expensive parts. Such sacrificial gears may be a simpler alternative to other overload-protection devices such as clutches and torque- or current-limited motors.

3. Flip-flop hub - Wikipedia

   en.wikipedia.org/wiki/Flip-flop_hub

   There are several different types of flip flop hubs available for different applications. Their main purpose is to allow changing between two (and only two) different gear ratios on one rear wheel without the added complications of a multi-gear derailleur or internal hub gear, or between fixed and freewheel options. By removing the rear wheel ...

4. Gear manufacturing - Wikipedia

   en.wikipedia.org/wiki/Gear_manufacturing

   Gear manufacturing refers to the making of gears. Gears can be manufactured by a variety of processes, including casting , forging , extrusion , powder metallurgy , and blanking . As a general rule, however, machining is applied to achieve the final dimensions, shape and surface finish in the gear.

5. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Freehub: a ratcheting assembly onto which a cog or cassette is mounted that allows the bicycle to coast without the pedals turning; Freewheel: a ratcheting assembly that incorporates one or more cogs and allows the bicycle to coast without the pedals turning; Gusset: plates added to the outsides of frame tubes to strengthen joints.

6. Sturmey-Archer - Wikipedia

   en.wikipedia.org/wiki/Sturmey-Archer

   All Sturmey-Archer gear hubs use epicyclic (planetary) geartrains of varying complexity. The AW is the simplest, using one set of planetary gears with four planets. The AM uses three compound planets with differently sized cogs machined from a common shaft to engage the gear ring and sun gear separately, while the close-ratio three-speeds, and hubs with four or more speeds, use multiple ...

7. Composite gear housing - Wikipedia

   en.wikipedia.org/wiki/Composite_gear_housing

   The composite gear housing does not remove heat as efficiently as an aluminum or magnesium housing. Composite gear housings require more expensive and reliable cooling systems. However, composite plastic material is widely used on low-power applications such as gear motors for electromechanical actuators. Lightly loaded rotary gear actuators ...