According to the Tirerack @ http://www.tirerack.com/tires/tires....eMake=Michelin
they start life @ 10/32nds of tread. So the fronts are down "30%" and the rears "50%". (That's assuming you run to 0/32nds of tread, but we would't do that
I'm guessing you have a solid 4/32nds left to play with for the fronts.
If the seller disagrees with me, I certainly do apologize.