I assume that there are advantages to having a lower treadwear rating, e.g. 140 on our Bridgestones. For example, is the tire compound softer resulting in better handling but shorter tread life?
2014 Z4 28i Melbourne Red
2011 135i Coupe Space Gray (Sept. '10 ED)
2009 Z4 35i Titanium Silver (retired)
2008 335i Convertible Space Gray (retired)