Are these slicks any good? Usually when I am at the track I see lots of hoosiers or m/t. But m and h makes a 27/9/15 that will fit perfect in my car. 28's are going to be pretty close. I run a 275/60/15 on the street and have barely half inch of clearance all around the tire. If that is enough clearance then I would like to run the 28/9/15 but think after tire growth I am going to have a problem. Any input would be appreciated.