little pulleys that both keep the chain taut and guide it onto the cogs. When you shift gears, the derailleurs move the chain onto a larger or smaller cog in the cassette. This changes the ratio ...

In applications that are characterized by intense startup energies, chain drives are simply the logical choice because of ...

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having a suitable framework attached to the wall for the support of two pulleys, one fixed and the other movable, the movable one descending by its own weight ; or if needful it may be weighted A ...

This gearbox dummy confirms the prototype bike’s name, as well. And interestingly, the glimpses of the gearbox itself both feature a Gates centerline-style belt cog. Presumably then, this Atherton DH ...

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Products are independently selected by our editors. We may earn an affiliate commission from links. When Jean-Louis Dumas first designed the Birkin—a simple work bag with a gleaming gold clasp ...