Last post on Apr 07, 2010 at 9:24 PM
You are in the BMW 5-Series
What is this discussion about?
BMW 5 Series, Tires, Sedan, Wagon
#9 of 10 2010 528i
Dec 30, 2009 (1:16 pm)
At highway speed the car seems to want to go right and left. They checked alignment and added air to 39 in all tires, still have the same problem, is it the run flat tires? Tire pressure?? Anyone know of a fix?? I have 700 miles. At low speeds it feels ok. I have sport pkg and run flats. I also have active steering which is supposed to make it drive better at high speed.
#10 of 10 Tramlining
Apr 07, 2010 (9:24 pm)
This is due to longitudinal grooves on the highway surface. Hwy85 in SJ as of a couple of years ago (and may others) have those as a noise reduction feature. (Tire noise on highways is due to air in the contact patch not being able to escape and "pop". Grooves help avoid "popping"). This is tire-specific--softer sidewalls/less aggressive tread seems to alleviate some of the effects. See http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=47 for more info.