Treadwear ratings are pretty arbitrary, as there is no government or industry standard. You might use the rating to compare tires from the same manufacturer, but don't put too much weight on the rating when comparing tires from different manufacturers.

HTH.

Function before fashion. '96 Contour SE "Toss the Contour into a corner, and it's as easy to catch as a softball thrown by a preschooler." -Edmunds, 1998