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When I worked for a racing team that raced in IMSA in the 80s, we used to test at the same track Firestone would do tire testing. The funny thing about their testing was the vehicle they were using. Ford E150 van filled to its Gross Weight with lead weights. We would take turns using the track. Usually 20min. per session.
Anyway, I asked one of the engineers this exact question. He told me that it makes no difference in the dry but in the wet it is a must for proper tire performance. He said they would test directional tires in the wet (mounted backwards) to make sure they were not dangerous. He said underinflating and worn out tires are the most common tire failures. He never saw a tire mounted in the wrong direction fail because it was being used backwards.
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Justin
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