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About product and suppliers:
        Alibaba.com offers 4,249 21 speed bike rim products. About 1% of these are electric bicycle motor. 

A wide variety of 21 speed bike rim options are available to you, such as free samples, paid samples. 

There are 4,263 21 speed bike rim suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Belarus, which supply 99%, 1%, and 1% of 21 speed bike rim respectively. 

1 speed bike rim products are most popular in Domestic Market, Mid East, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 619 with ISO9001, 153 with Other, and 9 with ISO14001 certification.