It depends on what pawls you run in your P321 hub. I’ve been running mid-volume pawls with sleeved magnets with just Dumonde Tech oil and, while it’s a different sound, they’re in the same volume ballpark as the Hydra with a grease/oil slurry.
The original P321 ‘quiet pawls’ with oil is a bit quieter setup.
Dec. 19, 2019, 7:19 a.m. - Andrew Major
It depends on what pawls you run in your P321 hub. I’ve been running mid-volume pawls with sleeved magnets with just Dumonde Tech oil and, while it’s a different sound, they’re in the same volume ballpark as the Hydra with a grease/oil slurry. The original P321 ‘quiet pawls’ with oil is a bit quieter setup.