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I-55 & Tri-City only tire rule change for late models is the requirement for the LM 40 only on the right rear. Tri-City had said they were going to require you to use the same RR tire the entire night, but the next day they changed it to using the LM40 only on the RR. They no longer have the rule of using the same RR tire all night.I think in theory it has merit--the only drawbacks I can see is late in a feature cars will be running on a well worn RR--corse that's when driver ability will come to play---also the chain of supply regarding used tires will take a hit as many of the teams with $$$$ supply the lower buck teams with used rubber----JMO