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Yes you're right. On rwd car you can have up to 3% diference of rolling diameter without causing any problems, I think he's just around the 3% with that tire set up. On a awd it's only 1%. If I was the OP I would go back to the shop and have them change the tires to 225/45r17, those tires are to high compared to rears, and like you said the PSM light might come on with those tires.
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