Originally Posted by wrk2surf
I think Michelin stopped making the large desert tires and have moved toward a 450 tire with their rally tires.. not sure of the name
The tire was indeed redesigned for the 450cc bikes. It's new name is "Michelin Desert Race
They do fit on a 450X. One trick is to install a roller on the swingarm to prevent "inward" slop on the chain and the subsequent catching on the side knobs. It's easy--you just install another 450x upper chain roller oriented vertically on the swingarm. Here's the one on my 450X.