285/40R21 Tires

285/40R21 Conversion

When converted to inches, 285/40R21 is equivalent to 30x11.2R21.

285/40R21 tire has a section width of 11.2 inches which is the measurement of tire's width from its inner sidewall to its outer sidewall. Rim diameter of 21 inches represents the size of the wheel the tire can be mounted on. Sidewall height of 4.5 inches (114 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 30 inches (761 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 94.2 inches (2389.5 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. 285/40R21 tire makes 673 revolutions per mile (418 revolutions per kilometer).

285/40R21 Section Width
11.2"
30"
285/40R21 Tire Side
Tire Circumference
94.2"
21"
4.5"
673 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 761 mm 30"
Tread Width 285 mm 11.2"
Rim Diameter 533.4 mm 21"
Sidewall Height 114 mm 4.5"
Circumference 2389.5 mm 94.2"
Revolutions 418 per km 673 per mile

285/40R21 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 285/40R21 tire can be replaced with 25 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
295/35R21 29.1" (739 mm) -2.9%
315/25R23 29.2" (742 mm) -2.5%
305/30R22 29.3" (743 mm) -2.4%
235/45R21 29.3" (745 mm) -2.1%
265/35R22 29.3" (745 mm) -2.1%
265/40R21 29.3" (745 mm) -2.1%
305/35R21 29.4" (747 mm) -1.8%
315/30R22 29.5" (749 mm) -1.6%
275/35R22 29.6" (751 mm) -1.3%
245/45R21 29.6" (753 mm) -1.1%
275/40R21 29.6" (753 mm) -1.1%
315/35R21 29.6" (753 mm) -1.1%
285/35R22 29.9" (759 mm) -0.3%
295/30R23 30" (762 mm) 0.1%
255/40R22 30" (763 mm) 0.3%
255/45R21 30" (763 mm) 0.3%
295/35R22 30.1" (765 mm) 0.5%
295/40R21 30.3" (769 mm) 1.1%
265/45R21 30.4" (771 mm) 1.3%
265/40R22 30.4" (771 mm) 1.3%
305/35R22 30.4" (773 mm) 1.6%
275/40R22 30.7" (779 mm) 2.4%
315/35R22 30.7" (779 mm) 2.4%
325/30R23 30.7" (780 mm) 2.5%
275/45R21 30.7" (781 mm) 2.6%