Not covered under the warranty program : Products determined to be tampered with, modified or neglected, products that have been misused, products in lack of maintenance, products that are subject to normal wear and tear, products affected by a crash or sudden obscure impact, products damaged due to improper installation/reinstallation, products used for any purpose other than the intended use and second hand purchased products.
Fully ceramic sealed bearings so indeed there is no risk of oxidation.