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Well, the variety of responses you're about to get is bound to be entertaining. I just changed the tires for the first time on my LNC2, and have the small mains manufactured in China. For this perhaps prejudicial reason, I elected to replace them when almost all the tread was gone.  I was instructed too long ago that tires required changing if they showed any deformity or cord.  Let's see what other answers you get.
In the event you  missed the recent thread on techniques to avoid pinching your inner tubes in the process of tire changing, sing out.

ByronFox
LNC2
N3144C
Mill Valley, CA

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Please send your photos and drawings to marvkaye@olsusa.com.