305/45R20 Tire Size in Inches

305/45R20 is a metric tire size representation, which defines that the tires have a width of 305 mm, 45 is the aspect ratio and a rim diameter of 20 inches. In the imperial system the tire size 305/45R20 equates to a 30.8×12R20 that is commonly used in the automotive industry. So Converting 305/45R20 in inches the tires have a length of 30.8 inches, a width of 12 inches, a sidewall height of 5.4 inches and The number of complete resolutions made by the corresponding tire size is equal to 655 per mile with a circumference of 96.7 inches.

305/45R20 tire size in inches

305/45R20inchesmm
Tire Diameter30.8 inches782 mm
Tread Width12 inches305 mm
Rim Diameter20 inches508 mm
Sidewall Height5.4 inches137 mm
Circumference96.7 inches2455 mm
Revolutions655 per mile407 per km

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305/45R20 Equivalent Tire Sizes for replacement

If you are replacing your tires, always keep in mind that they are compatible with your vehicle so that the impact on the overall performance of your vehicle can be reduced. Here we have listed some tire size that is equivalent to 305/45R20 tires.

Tire Size Overall Diameter Difference
285/35R22 29.9″ (759 mm) -2.9%
285/40R21 30″ (761 mm) -2.7%
255/40R22 30″ (763 mm) -2.4%
255/45R21 30″ (763 mm) -2.4%
285/45R20 30.1″ (764 mm) -2.3%
255/50R20 30.1″ (764 mm) -2.3%
295/35R22 30.1″ (765 mm) -2.2%
235/55R20 30.2″ (766 mm) -2%
295/40R21 30.3″ (769 mm) -1.7%
265/40R22 30.4″ (771 mm) -1.4%
265/45R21 30.4″ (771 mm) -1.4%
305/35R22 30.4″ (773 mm) -1.2%
295/45R20 30.5″ (774 mm) -1%
265/50R20 30.5″ (774 mm) -1%
275/40R22 30.7″ (779 mm) -0.4%
315/35R22 30.7″ (779 mm) -0.4%
275/45R21 30.7″ (781 mm) -0.1%
275/50R20 30.9″ (784 mm) 0.3%
315/40R21 30.9″ (785 mm) 0.4%
285/40R22 31″ (787 mm) 0.6%
325/35R22 31″ (787 mm) 0.6%
255/55R20 31″ (788 mm) 0.8%
285/45R21 31.1″ (789 mm) 0.9%
255/45R22 31.1″ (789 mm) 0.9%
255/50R21 31.1″ (789 mm) 0.9%
325/40R21 31.2″ (793 mm) 1.4%
285/50R20 31.3″ (794 mm) 1.5%
295/40R22 31.3″ (795 mm) 1.7%
265/45R22 31.4″ (797 mm) 1.9%
245/60R20 31.6″ (802 mm) 2.6%
305/40R22 31.6″ (803 mm) 2.7%
295/50R20 31.7″ (804 mm) 2.8%

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