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Normally you want about a larger overall diameter on the rear tires so the traction control system does not activate. The on board computer monitors the wheel speed sensors and if it senses the rear wheels are rotating faster that the front , it kicks on the traction control system.....
IF the car is driving at constant speed and the rear tires are smaller diameter than the front, the rear wheel sensors will indicate such a condition since the circumference of a smaller diameter tire means it needs more rotations to match the speed on the larger diameter and circumference front tire.
The current front tires are about 25.7 " diameter ( depends on brand/model)
The proposed front tires are 26.9" diam.
The rears are 27.1"diam
As long as the rears remain larger diameter as they wear compared to the fronts you will not have any issues.
As 8VETTE7 said, those tires are almost the same diameter. I have a set now what are almost the same and I have to turn off traction control everytime I get over 55 MPG or accelerate hard taking off. It's a pain in the butt.
I'd look for a rear tire that is a litte larger in diameter.
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Tire Fitment Question!
