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About product and suppliers:
        Alibaba.com offers 7,059 stem size products. About 2% of these are other toys & hobbies, 1% are bicycle stem. 

A wide variety of stem size options are available to you, such as aluminum alloy, carbon fibre, and titanium. You can also choose from 25.1 - 26.5mm, 31.1 - 32.5mm, and 20 - 22.5mm. As well as from 26 - 35mm, 15 - 25mm, and 36 - 45mm. And whether stem size is free samples, or paid samples. 

There are 7,059 stem size suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of stem size respectively. 

Stem size products are most popular in North America, Western Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 1,273 with ISO9001, 718 with Other, and 180 with ISO/TS16949 certification.