Westlake Tires are Chinese made tires by a large parent company (HZCR), which also makes Chaoyang and Goodride tires. HZCR as a whole is about the 10th largest tire company in terms of revenue, and have been around since 1958. The brand had some negative press back in 2007 due to a safety recall. Westlake's tires are low priced and have decent reviews on Amazon.com, though we would recommend spending a little more and buying one of the top tier, best rated tires instead. However, if your budget is tight you may be considering these tires.
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While you can get the RP18 in the 205/55R16 size for $51 a tire (at the time of writing), we would also recommend looking at the Fuzion Touring tire ($63 per tire), based on its over 900 reviews and 40-55k mile warranty. However, the RP18 does represent a bargain, with a number of decent reviews that many generic brands cannot claim to have.
Read all Westlake RP18 reviews at Amazon