Achterderailleurs(72 products)

Rear derailleurs for precise shifting

How a rear derailleur works

The rear derailleur shifts between the different sprockets on the cassette. The derailleur is controlled by the shifter via a gear cable. The spring in the derailleur keeps the chain under tension.

Cage length

The cage length (short, medium, or long) determines which cassette ratios are possible. A short cage is sufficient for small cassettes on road bikes. A long cage is needed for large cassettes on mountain bikes and gravel bikes. Cage length affects chain tension and shifting performance.

Compatibility

Rear derailleurs must be compatible with the number of gears of the shifter and cassette. An 11-speed derailleur does not work with an 8-speed shifter. Also check compatibility with chain width. Shimano and SRAM derailleurs are not always interchangeable.

Maintenance

The rear derailleur is a vulnerable component exposed to dirt and damage. Protect it with a hanger that breaks on impact instead of the derailleur. Lubricate pivot points with grease and keep the gear cable clean. The chain must move smoothly through the derailleur.

A well-adjusted rear derailleur shifts smoothly and quietly. Check the cassette for wear and the chain for stretch. A chain link allows the chain to be opened for derailleur maintenance.