Sports climbing hardware designed to make rope traverses smoother and more reliable. Confidence for rope teams and riggers who need predictable performance when hauling or crossing. Is PETZL P21 Tandem Double Pulley the right pulley for frequent traverse and hauling work?
⚡ At a Glance
- • Sheave Efficiency: Self-lubricating bushings deliver smooth running on 9–13 mm ropes
- • Best for: Setting up Tyrolean traverses and hauling systems where smooth rope movement matters
- • Not ideal for: Use with ropes outside the 9–13 mm range or for speeds above 10 m/s
Double pulley designed specifically for Tyrolean traverses with sheaves on self-lubricating bushings. Attachment point accepts up to three carabiners, and maximum allowable speed is 10 m/s.
Smooth rope movement – with self-lubricating sheaves
Sheaves are mounted on self-lubricating bushings that reduce friction at the axle, maintaining rotation efficiency without frequent greasing. The bearing arrangement helps keep running performance consistent under load.
Smooth running reduces rope wear and makes long traverses less effortful for teams, especially during repeated shuttles and hauling.
Flexible rigging options – with an attachment point for up to three carabiners
The central attachment aperture is sized to accept up to three carabiners simultaneously, allowing multiple connection points or backups to be clipped at once. The layout simplifies reconfiguration of anchors and hauling setups.
Multiple carabiner capacity speeds up rigging and lets teams add redundant safety links or organise complex pulley systems quickly.
Clear operational limit – thanks to a 10 m/s maximum allowable speed
Maximum allowable speed is specified at 10 m/s, providing a tested limit for dynamic rope movement. The rating helps define the safe operational envelope for high-speed traverses and hauling.
A known maximum speed gives planners a straightforward parameter to avoid excessive rope velocities and maintain safer working conditions.
✨ The 4 Key Reasons for PETZL P21 Tandem Double Pulley
- Self-lubricating sheaves – Reduce maintenance by keeping bearings smooth for longer periods
- Suitable for 9–13 mm ropes – Ensures predictable handling with widely used rope sizes
- Triple carabiner attachment point – Lets users organise multiple anchors or rigging quickly and securely
- 10 m/s maximum speed rating – Provides a clear safety limit for high-speed rope movement scenarios
📋 Technical Details at a Glance
- Category: Sports
- Brand: PETZL
- Model: P21 Tandem
- Use: Tyrolean traverses on rope
- Rope compatibility: 9–13 mm diameter ropes
❓ Frequently Asked Questions
Q: What rope diameter works with the pulley?
A: Compatible with ropes of 9 to 13 mm diameter, as specified for safe and efficient operation.
Q: Can multiple carabiners be attached?
A: Yes, the attachment point can fit up to three carabiners simultaneously for flexible rigging and redundancy.
Q: Is there a maximum speed for rope movement?
A: Maximum allowable speed is 10 m/s, which sets a tested limit for dynamic traverses and hauling.
🏆 Our Verdict
Ideal for climbers, riggers and rescue teams who run Tyrolean traverses or perform regular hauling operations. Self-lubricating bushings, a triple carabiner attachment and a clear 10 m/s rating combine to deliver dependable, predictable rope handling. Durable construction and low-maintenance bearings make it a sensible long-term choice for frequent users.
