If thats the case, I would think it would be a function of the individual shock (brand) preload ring design, as far as the OD/length of the pilot section vs. the ID of the spring is concerned. I think this is a stretch, and would have been addressed a long time ago if it were a general problem. A steel spring covererd with dirt would make quick work of an aluminum preload ring during regular contact and it would be obvious at the next shock service, don't you think?
For $20 the bearing might be handy for setting up a new bike / clean shock especially for adjustments in the woods. I still think it will be useless after the elements take over though.
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