It doesn't take a rocket scientist to see that the M/T ET Street tire has a tread pattern. Yes, it has grooves because many of the street car racing organizations mandate them. But the grooves are part of a package that is most definitely a tight rope act. As an example, M/T engineers tested a number of different groove configurations. While the actual grooving configuration and method used to develop it are proprietary, Mickey Thompson found that the groove shown here showed the best performance and overall reliability during testing. Because of this, it made the grade for the production tire.