The bike chain drives a sun gear on the rear axle, which transmits power to planetary gears situated around it.

自行车的链条会驱动后轮轮轴上的太阳齿轮，将动力传送到四周的行星齿轮。

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Guangzhou Rong-chou Trading Company Main: chain, tubing, gears, bulbs and other motorcycle accessories.

广州市融宙商贸公司主营：链条、油管、齿轮、灯泡等各种摩托配件。

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It provides a economic and reliable technique for the castings of gears, chain wheels and so on.

为齿轮、链轮等铸件的生产提供了一种经济、可靠的工艺方法。

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Derailleur gears have a front mech (short for front gear mechanism) to shift the chain between two or three chainrings and a rear mech (short for rear gear mechanism) with up to 10 sprockets.

BBC: Sport