I am reading many good things about the Trail Attack from Conti. The tire does not have a two compound pattern, but it is softer at the sides, and harder at the center through heat a treatment procedure. This technique ensures continuous transition of the the compound texture. The rear has 9 mm tread, the front 5 mm.
Front Trail Attack by member "Vara" at
http://www.varaderoforum.com
I also heard the rubber composition has been changed recently, in order to increase mileage.