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About product and suppliers:
        Alibaba.com offers 3,232 four-wheel bike products. About 32% of these are bicycle, 4% are motorcycles, and 2% are electric bicycle. 

A wide variety of four-wheel bike options are available to you, such as kids' bike, tandem bike, and folding bicycle. You can also choose from 14", 16", and 22". As well as from steel, aluminum, and aluminum alloy. And whether four-wheel bike is yes, or no. 

There are 3,253 four-wheel bike suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Spain, and Bulgaria, which supply 99%, 1%, and 1% of four-wheel bike respectively. 

Four-wheel bike products are most popular in Western Europe, South America, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 440 with ISO9001, 307 with Other, and 25 with BSCI certification.