Originally Posted by WayneC1
There is not enough in the GS hub to take the bigger bearings, the G650X has a hub with 20mm axle, if you looked around and picked up a 650X hub many things may fall into place
Interested in more information re the WR250X disc size, did not know any used a 300mm rotor, they would be a potential source of caliper brackets
The X is the sumo version of the WR250R: 17" wheels and a 298mm front rotor with a different bracket and caliper. The bracket mounts to the standard WR/YZ forks so there's nothing special there. Sourcing the bracket and caliper from an X can be a problem since they're not very common, only found one on eBay so far. However there's plenty of 320mm bracket & rotor kits from China, don't know about the quality, but it's an option.
I've looked for G650X and F800GS wheels, but haven't found any for a reasonable price (for me less than the cost of the Hawk Kit). One of those would completely solve my problems!