Pulleys, arms, parts for derailleurs

Derailleur cages are the parts of the derailleur that guide the chain and help properly align the chain with the cassette for smooth and precise shifting. The cages always form a pair, an outer and an inner cage that hold the pulleys and maintain chain tension. The cages come in different lengths - short, medium, and long. The length of the cages determines the maximum cassette size that the derailleur can accommodate. Short cages are usually used for smaller gear ranges, while medium and long cages are suitable for bikes with larger cassettes designed for climbing or have a wider gear range.

Pulleys are gears that guide the chain through the arms of the derailleur. They help maintain tension on the chain and help the chain move smoothly during shifting. Pulleys also help keep the chain securely in place and prevent excessive chain noise or skipping. Pulleys are produced in different sizes and from different materials. The most common sizes are 10- and 11-tooth, but sizes can vary by derailleur make and model. The choice of material of the pulleys can affect the life and performance, with the choice being plastic, steel, or ceramic.

How to choose suitable pulleys and cages for your derailleur?

When choosing straps and pulleys for derailleurs, it is good to consider the following factors:

Compatibility: Make sure the derailleur cages and pulleys are compatible with the specific model and brand of derailleur. Different brands of derailleurs may have specific cages and pulleys designed for optimal performance with their components.
Chainring length: Consider chainring length based on your bike's cassette size and gear range requirements. Short cages are suitable for smaller cassettes, while medium and long cages are needed for bikes with larger cassettes or a wider range of gears.
Quality and material: Look for high-quality cages and pulleys made of durable materials. When choosing, consider factors such as weight, durability, and the type of bearings or sliding sleeves used (e.g. steel or ceramic).
Budget: Determine your budget, as derailleur cages and pulleys can vary in price depending on brand, material, and technology. Higher class variants may offer higher performance, less friction and longer life.

How to extend the life of pulleys?

Regular cleaning and lubrication, avoiding riding in harsh conditions and proper chain maintenance can help extend the life of the pulleys. It is also important to ensure proper chain tension and avoid cross guiding of the chain, which can cause additional load on the pulleys.

Are there any replacement pulleys that can improve shifting performance?

Some brands claim that their replacement pulleys offer better shifting performance, less friction or increased durability. However, the reality may differ, and it is important to choose reputable brands and consult with experts or read reliable reviews before buying.

Check out our video "Replacing the pulleys in the derailleur"

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Accessories for bicycle derailleurs

How to choose suitable pulleys and cages for your derailleur?

How to extend the life of pulleys?

Are there any replacement pulleys that can improve shifting performance?