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About product and suppliers:
        Alibaba.com offers 7,289 bicycle stem products. About 17% of these are bicycle stem. 

A wide variety of bicycle stem options are available to you, such as aluminum alloy, carbon fibre, and aluminum. You can also choose from 25.1 - 26.5mm, 31.1 - 32.5mm, and 32.6 - 35mm. As well as from broaching, mountain bike, and kids' bike. And whether bicycle stem is 56 - 65mm, 46 - 55mm, or 26 - 35mm. 

There are 7,376 bicycle stem suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Taiwan, and Australia, which supply 98%, 1%, and 1% of bicycle stem respectively. 

Bicycle stem products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 1,369 with ISO9001, 188 with Other, and 41 with ISO14001 certification.