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It is well known that tire force and moment properties are affected by numerous design variables such as tire size, type, compounding, and construction. It is also true that environmental conditions such as rain, snow, or road surface type can alter the cornering capacity of a tire. In this study, specific environmental parameters related to water on the roadway are varied to study the effects on the force and moment properties of modern radial tires. The parameters under study included translational velocity and water depth during standard sweep testing at two different vertical loads. The force and moment characteristics of seven different tires were tested at the Calspan Tire Research Facility in Buffalo, New York. The slip angle sweep tests were conducted on the Flat Trac tire machine at various belt speeds, normal loads, and water depths.