240/40-R18 vs 225/40-R18 Tire Comparison - Tire Size Calculator

225/40-R18 tires are 0.47 inches (12 mm) smaller in diameter than 240/40-R18 tires and the speedometer difference is 1.9%

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240/40-R18 vs 225/45-R18 Tire Comparison - Tire Size Calculator