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Mountaineering Pulleys

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Will I find mountaineering pulleys available at decathlon.com.gr?

Of course! At decathlon.com.gr you will find certified climbing and mountaineering pulleys. The collection includes compact emergency pulleys, progress-capture pulleys with integrated belay mechanisms, tandem double pulleys for Tyrolean traverses, as well as sealed ball-bearing models from specialized Decathlon brands, meeting all international UIAA and CE safety standards.

How do I calculate the efficiency of a pulley in a rescue system?

A pulley's efficiency is expressed as a percentage (%) and determines how much applied force is lost due to friction.
For example, a pulley with 90% efficiency allows the transfer of 90% of the force, losing only 10% to friction. To calculate the actual mechanical advantage of a hauling system (e.g., 3:1), you multiply the theoretical ratio by the efficiency of each pulley involved in the rope path.
The higher the efficiency (ideally 90%-95%), the less effort is required to haul the load.

What is the difference between a ball-bearing pulley and a self-lubricating bushing pulley?

The difference lies in the internal rotation mechanism, efficiency, and durability:
• Self-lubricating bushing pulleys offer lower efficiency (around 70%-75%). They are more economical, lightweight, and suitable for occasional use or emergency hauling systems.
• Sealed ball-bearing pulleys offer exceptionally high efficiency (90%-95%), extremely smooth rotation under heavy loads, and long service life, making them the ideal choice for intensive use, heavy loads, and professional rescues.

Can I use a pulley for a Tyrolean traverse?

Of course, but you must choose the correct type! For a Tyrolean traverse or zipline, double in-line pulleys (tandem pulleys) with two sheaves are used exclusively.
A tandem pulley ensures complete stability on the rope or steel cable, preventing the climber from twisting. Furthermore, always check whether the pulley is compatible with the line material (textile rope or steel cable).

When do I need a double pulley instead of a single pulley?

A double pulley (featuring two independent sheaves side-by-side or in-line) is necessary in two main scenarios:
1. For constructing complex mechanical advantage haul systems (such as 4:1 or 5:1) where two parallel rope strands need to run without tangling.
2. On horizontal rope traverses (Tyrolean) to maintain balance and smooth gliding when crossing ravines or rivers.

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