Feature:
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STURDY AND DURABLE:Made of quality plastic POM material, wear resistant, sturdy and durable. Flexible rotation, better compatibility.
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FASTER SPEED: Plastic material reduce resistance and improve cycle efficiency. Positive and negative tooth guide wheel, no strange sound, faster speed.
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LIGHTWEIGHT AND PRACTICAL:Fine workmanship, high precision, can better adapt to other components.Lightweight and practical, no additional burden on bicycles.It also can reduce drag force which can improve cycling efficiency.
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SUIT FOR:It run on smooth ball bearings, and it's a necessary accessory for your bicycle. Options: 11T, 12T, 13T, 14T.
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ULTRALIGHT INNER BEARING: Inner plastic bearing is ultralight and owns high degree of lubrication, which can ensures its smooth working.4 different type for you to choose, meet your different needs.