I have a '06 950. 19k miles and the sprockets look fine - so far. I have youthful experience with worn sprockets - buy I was young then and had better things to spend my $$ on. I know what to look for in worn sprockets and chain. I lube adequately (I think) - every 300-500 miles and I don't 'horse' on the drive train. I'm just curious how many miles some of you inmates are getting on their sprockets. Thx guys!