Quick Summary
The Petzl Tandem Speed is a double pulley for textile ropes and steel cables. It has stainless steel sheaves on sealed ball bearings, a stated efficiency of 95%, and a listed weight of 270 g. Its stated diameter limits are up to 13 mm for textile rope and up to 12 mm for steel cable.
Key Details
| Detail | Product information and buyer relevance |
|---|---|
| Rope compatibility | Textile ropes up to 13 mm in diameter. |
| Cable compatibility | Steel cables up to 12 mm in diameter. |
| Sheaves and bearings | Stainless steel sheaves mounted on sealed ball bearings. |
| Stated efficiency | 95%. |
| Stated traverse speed | Up to 20 m/s. |
| Attachment point | Accepts up to three carabiners. |
| Weight | 270 g. |
Key Features Explained
The double-pulley design is specified for use with either textile rope or steel cable, within the listed diameter limits. The stainless steel sheaves and sealed ball bearings are construction details; the stated efficiency is 95%. The large attachment point accepts up to three carabiners, which the product description identifies as useful for complex mechanical-advantage or redundant safety-system setups.
Compatibility, Size and Fit
Check the actual line type and diameter against the stated limits: textile rope must be no more than 13 mm, and steel cable no more than 12 mm. These are separate limits for different line types. Do not assume compatibility with a line outside those stated categories or diameters.
What to Compare Before Buying
- Line: Confirm whether the setup uses textile rope or steel cable and verify its diameter against the corresponding limit.
- Carabiners: The attachment point accepts up to three. Check the intended configuration and the carabiners’ suitability for it.
- Traverse speed: Compare the intended speed with the stated maximum of 20 m/s.
The listed speed and efficiency figures do not provide setup instructions or establish suitability for every system.
Before You Decide
Confirm the line type and diameter, the carabiner arrangement, and whether the stated speed limit fits the intended setup. Follow the manufacturer’s instructions for selecting, configuring, and using this equipment.
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