Tyres 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 tyres be of the same size, construction (radial, non-radial) load and speed rating. Never mix radial and bias tyres on the same axle. When Radial tyres are used with Bias on the same car, the radials must always be placed on the rear axle. A single new tyre should be paired on the rear axle with the tyre having the most tread depth  among the remaining tyres.