Petzl's TANDEM SPEED is a double pulley designed for rope travel. Particularly effective for low-gradient zip lines, it allows a maximum speed of 20 m/s.

The TANDEM SPEED is a double pulley designed for rope pulleys, with wear-resistant stainless steel sheaves mounted on sealed ball bearings to ensure very high performance.
Up to three karabiners can be fitted to the attachment point of this pulley for easy manoeuvring.

The TANDEM SPEED technical manual no longer indicates compatibility with a cable from September 2021. However, this pulley has stainless steel rollers, so it can still be used on ropes up to 13 mm in diameter. The PETZL brand authorises the use of this pulley on ropes up to 13 mm in diameter for all uses outside the High Wire Ropes environment.