245/45-R17 tires are 0.65 inches (16.5 mm) larger in diameter than 255/40-R17 tires and the speedometer difference is 2.5%. 245/45-R17 tires are 8.84 inches (224.5 mm) larger in diameter than 205/30-R12 tires and the speedometer difference is 34.4%. The 285/70R17, with a diameter of 32.71 inches, provides 1.24 inches more ground clearance than the 245/75R17 at 31.47 inches. This added clearance is useful for off-road driving, helping prevent scrapes and damage from obstacles. However, the larger diameter also causes a lower speedometer reading for the 285/70R17 compared to the 245/75R17. Shop 245/45R17 Tire Size. 245/45R17 tires are commonly found on performance-oriented cars. If you drive an Audi A4, BMW 525i, Cadillac CTS, Ford Mustang, Lexus IS250, Mercedes-Benz E350, Pontiac GTO, or Volvo S80 then there’s a chance your ride has 245/45R17 tires, and a brand new version of any of these cars might’ve left the factory with 245/55-R17 tires are 1.93 inches (49 mm) larger in diameter than 245/45-R17 tires and the speedometer difference is 7.0% 245/45-17 255/40-17 Difference; Diameter inches (mm) 25.68 (652.3) 25.03 (635.8)-0.65 (-16.5) -2.5%: Width inches (mm) 9.65 (245) 10.04 (255) 0.39 (10) 4.1%: Circum. inches (mm) 80.68 (2049.26) 78.64 (1997.42)-2.04 (-51.84) -2.5%: Sidewall Height inches (mm) 4.34 (110.25) 4.02 (102)-0.32 (-8.25) -7.5%: Revolutions per mile (km) 785.33 (487.98 Tools & Tech: 225-45R17 tire size comparison with 1010tires.com Tire Size calculator. Use our tire calculator to compare tire sizes based on tire diameter, radius, sidewall height, circumference, revs per mile and speedometer difference. 275/45-R17 tires are 1.08 inches (27.5 mm) larger in diameter than 275/40-R17 tires and the speedometer difference is 4.0%. BUY 4 AND RECEIVE 30 DAY SATISFACTION GUARANTEE. 2023 Canstar Most Satisfied Customers Award. 245/45ZR17 99Y XL. $345. 4. See the entire range of 245/45R17 tyres available from JAX Tyres & Auto. Order online or call JAX Tyres & Auto on 1300 367 897 for the best advice and best 245/45R17 prices. WDLqg.