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If you want to run anything other than OEM (including Type S) or Mahle Gold pistions (also possibly those ebay Nipon pistons), then you need to resleeve with iron sleeves.
FRM sleeves you have 0.25mm to play with. Any scaring deeper than that and you would have to resleeve. Should be able to get an idea of the condition by visually inspecting as well as running your finger across the surface.
For a simple rebuild, there is no need to resleeve. If you have more serious goals, then you may want to resleeve even if your FRM sleeves are ok.
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