SIL and I have a question. Men are away so can't ask them and SIL wants to deal with this herself. The tires on our brothers and SIL TT are wearing funny. They have about 1500 kilometres on ...
If by the "inside row" you mean the center of the tire, it could be over inflation.
Too much air for the load can make the center of the tire pooch out (commonly called "crowning"), reducing the contact patch of the tire to the center few rows of tread.