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I'm waiting on @mdcc_tester
Inboard discs can be made to work in a cycle wheel, Honda put them on the VT500 (they were shit).
![](http://i.ebayimg.com/00/s/Njg1WDEwMjQ=/$(KGrHqJ,!ooFHjvkcRoWBR6vJrjyQQ~~60_57.JPG)
They put the caliper mount inside the disc, like Buell but shrunk to hub size
The trouble is, you still need a hub that's about the size of the brake rotor, so you don't really solve the aero issue, and you have to react the brake torque closer to the axle, making the bending moment on the end of the fork blade even more concentrated than it is with normal disc brakes.
No an interface with the rotor mount/axle. Caged ball bearings or needle bearings. Like I say that couldn't be stiff – that would be down to the axle.
I'm waiting on @mdcc_tester to arrive with an obvious reason this idea is junk.