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Message: <blockquote data-quote="I33t" data-source="post: 28763" data-attributes="member: 434">All the while ignoring the ride and handling impact, high cost, of larger, heavier, harder, tyres.You don't think BMW looked at the options at the design stage and used their engineering expertise to hone in on the optimal tyre and rim combinations, they just asked the marketing department to draw up some fancy wheel designs the day before they sent the car into production? Pfft. I think we're heading past scepticism here.I don't know what method BMW uses, but search on wikipedia for 'Finite Element Analysis' to get an idea of the type of analysis that would have been used to deliver the optimal solution for the engineering parameters selected.</blockquote>