This Report has been authored by:Ed Terrill at Akron Rubber Development Laboratory Inc. #with# John Harris at Transportation Research Institute #with# Larry Evans at Transportation Research Institute #with# James MacIsaac at Department of Transportation-National Highway Traffic Safety Admini????????

The RR of tires was measured by five test methods in two laboratories. Individual tires were measured as a first test new tire and as subsequent tests on the same tire after measurement on other tests and/or by another laboratory. Significant offset between data generated by the two labs was found.