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Of course you can but the question is should you. It is never recommended to go over 3% difference in overall diameter. The 225/40-18 will be 3.43% smaller in overall diameter. Your speedometer will read 62.1 at a true 60 mph. I would not recommend this swap.

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Q: Can you replace a 225 45r18 tire with a 225 40r18 tire?
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