Those are standard English 9/16 x 20 threads, or close enough that it's not an issue. Nice Nervar crankset, too - with the stock rings you have, the inner ring is the Nervar-only 128 mm bcd (though some of us have learned to artfully dremel 130 bcd rings 1 mm inward to make them fit), or if you felt like it you could run T.A. or Velo Orange rings.