305/45R20 Tires

305/45R20 Conversion

When converted to inches, 305/45R20 is equivalent to 30.8x12R20.

305/45R20 tire has a section width of 12 inches which is the measurement of tire's width from its inner sidewall to its outer sidewall. Rim diameter of 20 inches represents the size of the wheel the tire can be mounted on. Sidewall height of 5.4 inches (137 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 30.8 inches (782 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 96.7 inches (2455.5 mm) is the outer perimeter of the tire. Tire revolutions indicate the number of times a tire revolves while it covers the distance in miles or kilometers. 305/45R20 tire makes 655 revolutions per mile (407 revolutions per kilometer).

305/45R20 Section Width
12"
30.8"
305/45R20 Tire Side
Tire Circumference
96.7"
20"
5.4"
655 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 782 mm 30.8"
Tread Width 305 mm 12"
Rim Diameter 508 mm 20"
Sidewall Height 137 mm 5.4"
Circumference 2455.5 mm 96.7"
Revolutions 407 per km 655 per mile

305/45R20 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 305/45R20 tire can be replaced with 32 compatible tire sizes. Select optional plus size to see its specs.

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%