On the 2009 Cadillac SRX, it’s true that the front tires and the back tires ARE different sizes, UNLESS this is the “Sport” model. If not…
The Front calls for: P235/60/R18 and the Rear calls for: P255/55/R18.
If this is the base-model with the V6 engine, the Front is: P235/65/R17 and the Rear is: P255/60/R17
If this is the “Sport” model, then ALL the tires are: P255/50/R20
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