"Meet the MX1 HAWKSTONE GP - your ultimate weapon for sand and mud terrain domination. This tire is more than just a tire; it's your key to triumph. Like all PLEWS TYRES it is a ""Factory SPEC"" tire we don't do ""PRODUCTION SPEC"" like the other guys. If we have the best that's what you get we don't pick and choose what we offer to the general consumer. This means that the tire has a very unique Rubber/Silica blend that combines performance and longevity which are two characteristics that are hard to combine in a single tire. The Hawkstone GP has extra bracing on the paddles to prevent rollover when the track conditions get firm, and a redesigned side tread block to add better side bite.