Well, I dunno. But on the ones I've replaced, I'm almost positive that I didn't have to take the rotor off the hub. I just replaced a set last summer in a Warrior. You have to drive them out from opposite sides, of course (fromt he back for the outside ones and from the front for the inside ones) but I don't think I've EVER had the rotors off the hubs on any of the Warriors I've had (a total of six) and I've changed prolly four sets of wheel bearings.
'98/'04 MX Warrior...racing again! LoneStar, Wicked, Works all around, Web, Arias, Noss, DG, Douglas, etc., etc., etc. Gotta go...sponsors to please and Hondas to beat :)