I think it'd be better as a self-contained aftermarket thing, rather than having to buy a whole new wheel (which is how I understand it).
It'd be better, perhaps, to attach a magnet to the frame and have some LEDs with in-built copper induction coils bolted to the spokes. The coils wouldn't have to be big heavy ones - since LEDs use so little power they'd be tiny weeny.
He needs to put his saddle up a bit.
I think it'd be better as a self-contained aftermarket thing, rather than having to buy a whole new wheel (which is how I understand it).
It'd be better, perhaps, to attach a magnet to the frame and have some LEDs with in-built copper induction coils bolted to the spokes. The coils wouldn't have to be big heavy ones - since LEDs use so little power they'd be tiny weeny.