New tires mounted on the Front
The worn rear tires have less tread and lower hydroplaning resistance. They can lose their grip on wet roads, causing the rear end of the vehicle to swing around out of control.
New tires mounted on the Rear
Deeper tread with greater hydroplaning resistance helps new tires grip wet roads. The driver can steer to compensate for the lower wet traction of the worn front tires and safely maintain control.