I've got 4.5 days on my tires (brakes gave out halfway through my most recent day at Autobahn) and I'm not having any problems with traction on either end. These are showing a lot of blue on the right side, though. Do I need to slap a new set of shoes on, or can these still be used? http://i.imgur.com/iQv101X.jpg
Looks fine to me.. But I know people that ALWAYS SAID when in doubt toss it out... I personaly have been using their tires for decades... : )
When I ran Michelins I would run the rears till they were slicks and I would get one front to two rears.