Tsubaki’s new SN low noise drive chain is claimed to be between 6 and 8dB
quieter than standard roller chain, which it directly replaces for speeds
up to 200m/min. The usual cylindrical roller is replaced by a coil spring
roller, which absorbs the noise produced when it engages with the
sprocket teeth. In addition to lower overall noise, the arrangement also
reduces ‘jarring’ noises.