Uploaded April 2017 | Updated September 2026, 3 weeks ago

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I show and explain how indexed shifting works on a bicycle with the shifters and derailleur working together to move the chain to specific cogs on a freewheel/cassette. The bikes in the video have Shimano SIS (Shimano Index System) derailleurs, but indexing works the same on other brands of drivetrains such as Campagnolo and SRAM.

Additional resources:
Art's Cyclery Science Behind the Magic | Drivetrain Compatibility"
blog.artscyclery.com/science-behind-the-magic/science-behind-the-magic-drivetrain-compatibility

Sheldon Brown Cog Spacing Crib Sheet:
sheldonbrown.com/cribsheet-spacing.html

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