Originally Posted by jumbofrank
Some quads come with good tires stock but some come with really crappy tires. Sometimes the manufacturers put lightweight tires with shallow traed on to keep the overall weight down.
That might be the case sometimes. I think most of the time they put crappy tires on them to save money. And also very mild-treaded tires put less stress on driveline components. The mud machines like the XMR and Mudpro must have the driveline beefed up a bit over regular versions of the same displacement quad to handle the bigger and heavier aggressive tires.