24540-R18 tires are 0.31 inches (8 mm) larger in diameter than 235/40-R18 tires and the speedometer difference is 1.2%.
22555-R17 tires are 0.11 inches (2.9 mm) smaller in diameter than 225/50-R18 tires and the speedometer difference is 0.4%.
22540-R18 tires are 0.53 inches (13.5 mm) smaller in diameter than 215/45-R18 tires and the speedometer difference is 2.1%. Thesidewall is only 3mm shorter for 245/40 compered to 225/45, that is about 1/8". But you also have the option to fit 245/45-18 which has 9mm (3/8") taller sidewalls than 225/45. Ah got it, thanks for the info! That little of a difference shouldn't impact ride quality much then. I run 245/40/18 currently for winter.
Tiresize comparison. 235/40 R18 vs 225/45 R18. Calculate. CM INCHES. If your speedometer reads: Real speed is: Size difference between 235/40 R18 and 225/45 R18 tires. In the tire comparison table above, you can
22560-R18 tires are 1.77 inches (45 mm) larger in diameter than 225/50-R18 tires and the speedometer difference is 6.2%. SySU9.
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    • 225 45 r18 vs 225 40 r18