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I guess it may be just the old guy doing it the 'old' way. When radial tires first became popular there was a belief that the belts get used to traveling in one direction as they get broken in. The thought was that once broken in, that same direction of travel should be maintained to lessen the chance of belt separation. Not sure if that was fact or fiction. Doing the cross over tire change means that tires will now be running in the opposite direction (backwards) from where they were removed. I doubt this procedure would affect or in any way harm the modern tire. Also, many of today's tires are 'directional' so they should never be used in the cross over system.
Peter
Peter