The size 225/75 R16 is indeed compatible with this model of snow chain according to the manufacturer König, who explicitly mentions it in their lists of compatible sizes. However, this size does not appear in the list of sizes on Galaxus, which may be an omission or a difference in selection on this site. To be on the safe side, it's best to rely on the manufacturer's official indications, which include 225/75 R16 as a suitable size.