White Oak (closed cell wood) will take more wet/dry cycling than Red Oak or Ash (both open cell woods). Yes a real disk will see temperature and humidity extremes in use. I remember my brother rebuilding an old disk in Farm Shop class. I'm sure he used oil/grease soaked White Oak for that.
I have used hard maple for chain tightener blocks. Usually soak the maple in hot oil initially and then lubing the chain after each use keeps them from drying out. Example; some garden tractor snow throwers with drive chain.
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