What key engineering principle did Macmillan's rear-wheel drive establish, which is aligned with modern bicycle design?

Answer

The separation of steering and propulsion

By driving the rear wheel, Macmillan separated the function of steering (handled by the front wheel) from the application of power, leading to better stability compared to designs where the front wheel served both functions.

What key engineering principle did Macmillan's rear-wheel drive establish, which is aligned with modern bicycle design?
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