The P4 profile roller chain® has become a standard for many crane manufacturers, and runs smoothly and with low vibrations due to its tribo-optimised rollers.. The P4 underwent a noise test in the exterior grounds of the igus® lab Various travel speeds up to 4 m/s and various measurement parameters demonstrate that the general noise level is very low, and that the system travels with no vibration. The system has a noise level of 76 dB at 4 m/s.