i am think of putting new 20inch rear razrs and 21 inch front razrs on my 98 sport400. i was wandering how they do in different terrains(mud soft pack hard pack snow etc.) i also would need some pressures to run in the tires. i wheelie jump do doughnuts and powerslides and ride on tracks and trails.

 

Try 3 1/2-4# for mud or very soft terrain and 6psi for the hard or rocky stuff or jumping