I was looking for this topic long time ago. Finally! In my opinion it's no only the wheels weight you have to consider also the tire weight ours contis tires are 22lbs heavy there is another conti four season that it's no good rated in winter but they weight only 20lbs when u go to tirerack website select the tire u like and click on the "spec" u can see the tire weight there http://www.tirerack.com/tires/Spec.jsp?make=Continental&model=ContiExtremeContact&partnum=245WR7CECV2&vehicleSearch=true&fromCompare1=yes&place=4
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