Anti-dive is hardly a consideration with no suspension. What counts, though, is not the location of any particular component, but the combined center of gravity and its relationship to the tire contact patches. If the heavy bits are mostly close to the cg, there is less polar moment of inertia, and things like stoppies can happen faster, if they can happen at all. A relatively high cg will cause more pitching or dive under braking if there is suspension, and so the suspension geometry is sometimes adjusted to resist it, often using brake reactions. Arranging for the front wheels to move forward on bump helps too, but adds harshness.
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