Some rings are symmetrical, with the teeth centered, while others have teeth offset toward one side or the other.
Unfortunately, there's no standard. Manufacturers adjust the offest to work with their cranks to yield the exact separation they want.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.