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I suspect the standard rear axle was replaced with the two near-centerline
wheels and chain drive as a weight saving measure.
It may not be relevant to this thread vis-a-vis extreme FE, but moving the rear
wheels so close together may have qualified the the vehicle as a three wheeler
-- that is to say a motorcycle -- under the regs/laws at the time.
How this might have helped in the FE effort is open to speculation.
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