suspiciously loud until I added oil. then silent. description says "Lubrication:Self Lubricated withGrease" (sic) but there's no way. either these were used and resold as new were never lubed to begin with or were so old that the lube somehow dissipated (not likely). either way this does not encourage confidence in a product where specs cannot be easily verified- makes me wonder what else in the product description is not true (bearing rating etc.).