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smooth stiff tread, and inertia keeping. AERO thoughts go right by the window (pun), this needs weight or a mimick of it, balance and lubes.
I learned this in an old sube. Maine highways are like that too, with the hills. I do not think they thought of eventual 65mph speeds.
The sube is bizarre in the trait of heavy flywheel, self balanced engine. mimicks weight. Takes a longer hill...
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