Why does my all-wheel-drive vehicle need the same tires? We recommend that all four tires are replaced at the same time. On all-wheel-drive vehicles the computer and differential work simultaneously to supply power to each wheel. If one of the tires is a different size than the others, the computer will take an incorrect reading and cause the differential to work too hard. If the vehicle is driven to long in this condition, it will burn out the drive train. Remember to rotate your tires to extend the life of the tires. Rotating the tires also keeps the tread wearing evenly and does not place strain on the drive train. Give us a call today to schedule an appointment to check over your tires. Also, make a $15 donation to our school supply drive and receive a FREE tire rotation.