22545-R17 tires are 1.34 inches (34 mm) smaller in diameter than 215/55-R17 tires and the speedometer difference is 5.1%.

Hereis a pic with 17" wheels and 225/45/17 tires. Gas Mileage - 1-2 mpg better with the 205's. Acceleration - No noticable difference. Top Speed - No noticable difference. Grip - My 225's are HP A/S tread for the summer, 205's are Blizzaks for the winter, not an even comparison.
vs225/50 R16; vs 215/55 R16; vs 225/60 R16; vs 225/60 R17; vs 255/40 R17; vs 195/55 R16; vs 225/55 R17; vs 225/50 R17; vs 225/40 R18; vs 205/55 R17; vs 215/45 R17; vs 23540-R17 tires are 0.22 inches (5.5 mm) smaller in diameter than 215/45-R17 tires and the speedometer difference is 0.9%. 22545/17 vs. 215/45/17 Tire & Wheel. Welcome to the North American Subaru Impreza Owners Club: Wednesday December 27, 2023: Home: Forums: Images: WikiNASIOC: Products Oh, as far as 225/40-17 sizes go, I think one reason it was chosen is that there are few, if any, 225/40-17 tires available. 225/45-17 is more common.
21540 R17 87W: 604mm--215/45 R17 91W: 625mm--215/50 R17 91V: 647mm--215/50 R17 95W: 647mm--215/55 R17 98W: 668mm--215/60 R17 96H: 690mm--215/65 R17 99V: 711mm--225/45 R17 91W: 215/55 R18 99V: 694mm--225/40 R18 92W: 637mm--225/45 R18 95W: 660mm--225/55 R18 98V: 705mm--225/60 R18 100H: 727mm--235/40 R18
EF6B.
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  • 215 40 r17 vs 225 45r17