Tension pullet for Cyclo derailleur

Tension pulley for Cyclo derailleur: an essential component for smooth shifting on vintage bicycles

The tension pulley for Cyclo derailleur is a key part of the drivetrain on vintage bikes equipped with Cyclo-type rear derailleurs. Designed to guide the chain and maintain constant tension, it ensures smooth, precise, and reliable gear changes. On classic touring bikes, road bikes, or randonneuses, keeping this pulley in good condition is essential to preserve both the bike’s authenticity and its mechanical performance.

Function and importance in the drivetrain

The tension pulley is located on the rear derailleur body, directly in line with the chain. As the derailleur moves across the freewheel, the pulley maintains proper chain tension and alignment. Without it, gear shifting becomes rough, and the chain may slacken, rub, or even derail.

Key characteristics

• Compatibility with Cyclo / Cyclo Benelux / Cyclo Touriste models depending on year and version

• Traditional materials such as cast aluminum, polished steel, or durable resin depending on the generation

• Bushing or bearing rotation system for smooth movement

• Tooth profile and diameter adapted for vintage narrow-pitch or half-pitch chains

• Mounted via axle or bolt, depending on derailleur type

Specific features for vintage bicycles

• Designed according to period-correct standards to preserve classic aesthetics

• Easy maintenance: simple disassembly for cleaning and lubrication

• Compatible with 3, 4, or 5-speed freewheels

• Available as original parts or high-quality reproductions

Why replace your tension pulley ?

With time, the pulley can:

• wear at the tooth profile,

• deform,

• develop play in the axle,

• or become stiff due to dried grease or rust.

Replacing it helps you restore smooth and quiet chain movement, improve pedaling comfort, and extend the lifespan of your freewheel, chain, and chainrings.

In summary

The tension pulley for Cyclo derailleur may be small, but it plays a crucial role in the drivetrain of a vintage bicycle. Choosing a pulley in good condition ensures precise gear shifting and smooth riding, while also maintaining the historical character of your bike.