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About product and suppliers:
        Alibaba.com offers 3,214 four-wheel bike products. About 28% of these are bicycle, 5% are motorcycles, and 2% are electric bicycle. 

A wide variety of four-wheel bike options are available to you, such as 16", 20", and 24". You can also choose from steel, aluminum alloy, and titanium. As well as from tandem bike, kids' bike, and mountain bike. And whether four-wheel bike is yes, or no. 

There are 3,215 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 North America. 

You can ensure product safety by selecting from certified suppliers, including 387 with ISO9001, 239 with Other, and 29 with BSCI certification.