Did the Ring Shrink?

[Zigûr]

Originally Posted by Inziladun

The question though, is why the One Ring would do that. Certainly it was only made for one person, Sauron. So why the flexibility in sizing? Maybe that was connected with the fact the it contained a large part not only of Sauron's power, but his will and fea as well. It simply adjusted itself to fit a temporary bearer until it could make its way back to its master.

It's also worth remembering that Sauron forged the One back when he could still change his form. Presumably he would need the One to be able to fit on any sized finger he might manifest (prior to the Akallabêth).