[MOTORHEAD]

For years we were told that once radial tires were run in one direction that they should not be reversed and run in the opposite direction as this could cause the belts to break loose causing a lump in the tire tread, and making it out of balance and roundness, and maybe even dangerous.
Some time ago as I was having balance problems with my truck tires, I was told that the "one direction only" rule for radials no longer applied.
Does anyone here have factual information on this subject ?

TIA
Ted