The MPT 81 is the most common tire purchased for customers that spend a good amount of time on-road as well as off-road. These tires are quiet at speed, offer low rolling resistance, and do excellent in Sand, Snow, and the Rocks. In extreme mud the MPT 81 tends to have a hard time clearing itself and the MPT 80 is probably a better option. The MPT 81 is a direct competitor to the Michelin XZL.