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We are specialize in Chainwheel&crank,The crank lenght from 89mm---178mmthe chainwheel :single double and tripleour products detail : full steel ,plastic coated and alloy model.About the steel model,Chainwheel: as usual the thickness: 2.35mm.Crank length: 89mm----178mmsuperficial treatment, we have ED FINISHED AND CP FINISHED.As usual, the CP finished is 8micron thick nickel plating and 0.03thick chrome.Plastic coated model,We also have single ,double and triple models.This model we have two level quality, one is the normal quality(Semi-raw materials),The other one best quality part used the Pure raw materials plastics to coated.You know what price, what goods, when you inquiry we will remark it clearly to you.Aluminum Alloy Seriers,We can do the full Alloy Chainwheel&crank, or steel chainwheel and Alloy crank.COLOR : BLACK OR SLIVER, CNC.Most of our customer are from South America, Panama, India, Turkey, Holland ,south Africa and so on.Also our ALLOY MODEL are selling to America, Japan and European marketAs your inquiry,I have the confidence that you will be found well worthwhile.