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About product and suppliers:
        Alibaba.com offers 3,111 21 speed bike rim products. About 100% of these are bicycle, 1% are ride on car. 

A wide variety of 21 speed bike rim options are available to you, such as steel, aluminum alloy, and aluminum. You can also choose from 26", 24", and 20". As well as from mountain bike, road bike, and folding bicycle. And whether 21 speed bike rim is 21 speed, 24 speed, or 27 speed. 

There are 3,121 21 speed bike rim suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Ireland, which supply 99%, 1%, and 1% of 21 speed bike rim respectively. 

1 speed bike rim products are most popular in South America, Africa, and Southeast Asia. 

You can ensure product safety by selecting from certified suppliers, including 661 with ISO9001, 156 with Other, and 7 with ISO14001 certification.