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Message: <blockquote data-quote="ylkhor" data-source="post: 149984" data-attributes="member: 3166">Tyre noise will be higher due to larger contact patch. Your 15" stock is 195mm, 17" will be 225mm ...that's extra 30mm contact patch for each tyre on the road. Better tyres with silica compound would be quieter and depending on the tyre thread too. Larger outer blocks would be noisier. But then again, noise is subjective to ppl ...some say bearable, some say noisy, some say didnt notice.Bumpier also yes, bcos tyre side walls are stiffer ...that's why u see the walls flat unlike comfort tyres that looks like a bulge for better cushioning and flexes.Sluggish is also yes but not that significant if your car has lots of torque. It's due to larger contact patch = higher friction = or they call it rolling resistance. Michelin Energy tyres has lower rolling resistance hence better fuel consumption too. But Energy tyres dont come in low profile  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" /> ALL IN ALL ....buying a bimmer esp a 3 series like yourself, means you wan sportiness la ...17" is a min to have and all the way to 19". You WON'T regret it!  :yahoo:</blockquote>