Originally Posted by pablo83
The Honda NX650 and XR650L have different sized axles, but use the same hub. They do this by using different wheel bearings. So it's highly possible you could do this with the DR's too, but I didn't measure the outer bearing diameters to see if they were the same. The DR250S's front hub has a four bolt rotor, and the 350's hub has a six bolt rotor so that's another difference between the two.
Older 350:s also has the 4 bolted rotor and 15mm axle.
Newer has the 6 bolted rotor and 17mm axle.