Reading sizing on a mandrel correctly

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Hi all,
I think it will be a quick answer on this but I haven’t been able to find an answer elsewhere.

I understand how to use a mandrel to read a ring size on a straight band but I can’t find any guide for a wide band with a tapered back. For example, if I have a ring that’s 20mm at its widest and 10mm at its narrowest, do I read the size from where the narrow or wide side falls on the mandrel?

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2

Slide the leading edge of the narrowest point of the ring shank up the mandrel until it stops.The size at the front of that edge is your ring size.

A ring that is very wide at the widest point is usually about 1/2 size larger than the measured size.

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Thanks so much! I appreciate ya!

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