My cadillac has P235/60R18 in the front and P255/55R18 in the rear. This is the factory spec. When I bought it, all threads are the same (new tires) but the front tires run out of thread when there is still 50% left in the rear.Question is 1. Why?Question 2. Can I just replace the two front tires with new ones and leave the rear as it isQuestion 3. The tire store said since it is 2005 cadillac srx AWD, they recommend all new tires on all four wheels, otherwise it will hurt the transmission. Is that true? I am fine if the tire ware is same, but looks like I have been driving with unequal threads in the front and back for a while when the threads have been waring out faster in the front wheels and thus the rear tires are becoming to have better threads.
It's never a good idea to swap out only two tires on a car, regardless of the drive type (FWD, RWD, AWD). It will affect the handling characteristics of the car negatively, depending on the situation. Sounds like the SRX's AWD sytem is front biased (more torque is being sent to the front wheels, so the car has FWD-like characteristics during normal driving), so your front tires wore out faster than the rear. Your best bet would be to change all four tires. Hope that helps
1. You cannot rotate your tires. 2. The reason why the front tires are worn out more is because the default setting for the car is to basically be a front wheel drive car and only become an all wheel drive car whenever the computer deems it necessary. 3. You must replace all four tires on an all wheel drive car. If any tire has more than a 1/16 inch tread difference between the other tires it will destroy the transfer case which costs several thousand dollars to replace.
The reason for the tires wearing more rapidly on the front is because of the steering, all cars will wear the steer tires at a faster rate than the non-steer tires.Thats the reason to rotate the front to rear tires in a criss cross pattern. Your car like other high performance cars utilize smaller tires up front to allow the vehicle a nose to the ground attitude, more slipstream and wind defeating.Unfortunately that eliminates tire rotation . Your factory tires I beleive are patterned directional and should not be rotated even front to front. You can replace just the front tires without ill effect, it is frequently done in the industry iecorvette,nissan, etcYou will not have transmission problems the final gear ratio is aquired by the tire itself, a difference between the right and left and front and rear overall outside dimension would be processed by the traction control module and compensate for iminor rregularities.It will not work on large tire changes as it will think the smaller tire are slipping because they rotate at a faster rate than the larger tires. Remember the tire store job is to sell tires. Your best bet is to consult the Cadillac dealership and see what their take is on it, good luck. nice car by the way
