I have a 2015 Cougar 21RBS TT that I have owned for ~1yr. I have started pulling the wheels for bearing/brake inspections and came across discoloration of the inside bore of the bearings and "only" on the bottom of the spindle for both inner and outer bearings. Other than the color, the surfaces are otherwise smooth. The rest of the bearings and races look good, and it was well lubricated. (pics below)
Question - After researching here and other forums, it may be fairly common and is called bearing fretting. Have others seen this, and if so, what did they do to address short-term and long-term?
After cleaning up the spindles, I plan to replace the bearings, races, and seals on all four tires with either National or Timken to "re-baseline". As a side note, it was easy to find the bearings locally, but not so easy to find the "double lip seal" needed for EzLube axles. The single lip seals and not nearly as robust, and and not spring loaded like the double lip seals and may cause some of the "blow by" into the brake drum some people have commented on that have used the EzLube feature.