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Since a motorcycle has wheels, the air pumping in to the body of a streamliner is far more important than ground effects.
Years ago one of the engineers that did the aerodynamics for the Vector HPV (which held the speed record for a few years), presented a paper at an IHPVA conference that showed about 1/3 of their total drag was due to air coming into the fairing and ground disturbance was negligible.
The point was that designing to take account for ground effects is a waste of time. Focus on internal airflow (for full streamliners).
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