305/40R20 Tires

305/40R20 Conversion

When converted to inches, 305/40R20 is equivalent to 29.6x12R20.

305/40R20 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 4.8 inches (122 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 29.6 inches (752 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 92.9 inches (2361.3 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. 305/40R20 tire makes 682 revolutions per mile (423 revolutions per kilometer).

305/40R20 Section Width
12"
29.6"
305/40R20 Tire Side
Tire Circumference
92.9"
20"
4.8"
682 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 752 mm 29.6"
Tread Width 305 mm 12"
Rim Diameter 508 mm 20"
Sidewall Height 122 mm 4.8"
Circumference 2361.3 mm 92.9"
Revolutions 423 per km 682 per mile

305/40R20 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 305/40R20 tire can be replaced with 40 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
285/30R22 28.8" (731 mm) -2.8%
245/35R22 28.8" (731 mm) -2.8%
285/35R21 28.9" (733 mm) -2.5%
325/35R20 29" (736 mm) -2.1%
285/40R20 29" (736 mm) -2.1%
295/30R22 29" (737 mm) -2%
255/35R22 29" (737 mm) -2%
255/40R21 29" (737 mm) -2%
255/45R20 29.1" (738 mm) -1.9%
295/35R21 29.1" (739 mm) -1.7%
145/80R20 29.1" (740 mm) -1.6%
305/30R22 29.3" (743 mm) -1.2%
235/50R20 29.3" (744 mm) -1.1%
295/40R20 29.3" (744 mm) -1.1%
235/45R21 29.3" (745 mm) -0.9%
265/35R22 29.3" (745 mm) -0.9%
265/40R21 29.3" (745 mm) -0.9%
265/45R20 29.4" (746 mm) -0.8%
305/35R21 29.4" (747 mm) -0.7%
315/30R22 29.5" (749 mm) -0.4%
275/35R22 29.6" (751 mm) -0.1%
245/45R21 29.6" (753 mm) 0.1%
315/35R21 29.6" (753 mm) 0.1%
275/40R21 29.6" (753 mm) 0.1%
245/50R20 29.7" (754 mm) 0.3%
275/45R20 29.8" (756 mm) 0.5%
285/35R22 29.9" (759 mm) 0.9%
285/40R21 30" (761 mm) 1.2%
255/45R21 30" (763 mm) 1.5%
255/40R22 30" (763 mm) 1.5%
285/45R20 30.1" (764 mm) 1.6%
255/50R20 30.1" (764 mm) 1.6%
295/35R22 30.1" (765 mm) 1.7%
235/55R20 30.2" (766 mm) 1.9%
295/40R21 30.3" (769 mm) 2.3%
265/45R21 30.4" (771 mm) 2.5%
265/40R22 30.4" (771 mm) 2.5%
305/35R22 30.4" (773 mm) 2.8%
295/45R20 30.5" (774 mm) 2.9%
265/50R20 30.5" (774 mm) 2.9%