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It depends upon the criteria that you use. "The largest tyre manufacturer" implies that they use the largest volume of resources to manufacture tyres. I find that difficult to believe. If you had said that they make the largest number of tyres, I could believe that because it makes no reference to the size of the tyres. If on the other hand you had asked which company converts the largest amount (weight or volume) of elastomers into tyres I suspect you might get a different answer. Similarly, if you compare on the basis of sales revenue you definitely get a different answer. I noted that in one recent year Bridgestone had a revenue (from tyre manufacture alone) of $26.2 billion; while Lego had a total revenue from all sales of $2.1 billion. On that basis, they certainly don't look like "The largest tyre manufacturer".