Should radial and bias ply tires be used on the same vehicle?

Using radial and bias ply tires on the same vehicle is not recommended because they have different handling characteristics, tread patterns, and flexing behavior. Radial tires are designed with steel belts and have a flexible sidewall, which allows them to maintain a larger contact patch on the road. This results in better traction, improved fuel efficiency, and enhanced stability at higher speeds. On the other hand, bias ply tires are constructed with layers of fabric that run diagonally, leading to a stiffer sidewall and less flexibility.

When both types of tires are mixed on the same vehicle, especially on the same axle, it can lead to uneven handling, which might cause difficulties during cornering or braking. The differing sidewall flex characteristics can also affect the vehicle's alignment and overall tire wear. This inconsistency can increase the risk of accidents, making it crucial to maintain uniformity in tire types on a vehicle to ensure optimal performance and safety. Thus, it is best practice to avoid mixing radial and bias ply tires entirely.