Copied from the Goodyear website:
Installing Tires on the Rear Axle
When tires are replaced in pairs, the new tires should always be installed on the rear axle, and the partially worn tires should be moved to the front. Driving with new tires on the rear axle can help the vehicle to maintain control on wet roads because the tires with deeper treads are more likely to resist hydroplaning.
When front tires have less tread than the tires on the rear axle, the vehicle is generally considered easier to control, since sliding would likely be the result of an understeer –which is easier for the driver to control by decreasing throttle. If worn tires are placed on the rear axle and a slide occurs, it’s likely the result of an oversteer (where the rear of the vehicle continues to move straight ahead). Oversteering is generally harder to recover from and decreasing throttle may actually amplify the negative effects of the oversteer.
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