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. Feb 1, 2018 · ‎245/45R17 : Section Width ‎245 Millimeters : Load Capacity ‎1708 Pounds : Tread Depth ‎11 32nds : Tread Type ‎Non-Directional : Ply Rating ‎EXTRA LOAD : Rim Width ‎8 Inches : Tire Diameter ‎25.70 : Item Diameter ‎17 Inches : Item Weight ‎27.62 Pounds : Manufacturer ‎Bridgestone : Model ‎Firehawk AS : Item Weight ‎27.6 245/45-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 0.67 inches (16.9 mm) smaller in diameter than 265/40-R18 tires and the speedometer difference is 2.6% About this item. See more product details. Buy Summit Ultramax HP AS 245/45R17XL 99W BSW: Performance - Amazon.com FREE DELIVERY possible on eligible purchases. 245/40 R17 in inches. 245/40 R17 tires' overall diameter is 24.7 inches, tire width is 9.6 inches, the tire can be mounted on 17 inches wheel and the circumference is 77.6". With that parameters, we can calculate that it will take approximately 816.5 revolutions per mile. So the closest metric tire size of 245/40R17 existing size in inches is .

245 40 r17 vs 245 45r17