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The Science of Shift, Bike Magazine Tech Feature

In this piece we set out to shine some light on the unsung aspects of drivetrain design that make seemingly simple bicycle transmission slide smoothly from gear to gear. I learned a lot about chain ring design and about the basic roller chain, and moreover developed a better understanding of how drivetrain engineers have to account for the particularities of the syncopated power source that is the human motor. For instance—”clocking” downshift points into chain rings when crankarms are positioned at 12- and 6 o’clock, when there is the least amount of leverage exerted on the system.

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