My service center tells me that when my S85 was delivered 6 months ago the tread depth of its new 19" tires was 9/32". I just had snow tires mounted and out of curiosity measured the depth of the removed normal tires to see how much they had worn in the just over 10,000 miles I've driven on them since new. Three measured 8/32" all the way across. The forth measured 8/32" on one side and the middle and slightly less on the other side. I'm no tire guy so I've no idea if that amount of wear is good or bad. Opinions, please? Good, bad, average or what? Many thanks!