Should I "mix" tire types on my car?

Tires of different size designations, constructions, and stages of wear may affect vehicle handling and stability. For best all-around performance, it is recommended that all tires be of the same size, construction (radial,non-radial) and speed rating. If tires of different speed ratings are mounted on a vehicle, the same size, type and speed ratings need to be placed on the same axle, the tires with the lower speed rating will be the determining factor for permissible tire related vehicle speed. Never mix radial and bias-ply tires on the same axle.