275/45R21 Tires

275/45R21 Conversion

When converted to inches, 275/45R21 is equivalent to 30.7x10.8R21.

275/45R21 tire has a section width of 10.8 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 4.9 inches (124 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 30.7 inches (781 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 96.4 inches (2452.3 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. 275/45R21 tire makes 657 revolutions per mile (408 revolutions per kilometer).

275/45R21 Section Width
10.8"
30.7"
275/45R21 Tire Side
Tire Circumference
96.4"
21"
4.9"
657 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 781 mm 30.7"
Tread Width 275 mm 10.8"
Rim Diameter 533.4 mm 21"
Sidewall Height 124 mm 4.9"
Circumference 2452.3 mm 96.4"
Revolutions 408 per km 657 per mile

275/45R21 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 275/45R21 tire can be replaced with 27 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
285/35R22 29.9" (759 mm) -2.8%
285/40R21 30" (761 mm) -2.6%
295/30R23 30" (762 mm) -2.4%
255/40R22 30" (763 mm) -2.3%
255/45R21 30" (763 mm) -2.3%
295/35R22 30.1" (765 mm) -2%
295/40R21 30.3" (769 mm) -1.5%
265/45R21 30.4" (771 mm) -1.3%
265/40R22 30.4" (771 mm) -1.3%
305/35R22 30.4" (773 mm) -1%
275/40R22 30.7" (779 mm) -0.3%
315/35R22 30.7" (779 mm) -0.3%
325/30R23 30.7" (780 mm) -0.1%
285/35R23 30.9" (784 mm) 0.4%
315/40R21 30.9" (785 mm) 0.5%
325/35R22 31" (787 mm) 0.8%
285/40R22 31" (787 mm) 0.8%
255/45R22 31.1" (789 mm) 1%
285/45R21 31.1" (789 mm) 1%
255/50R21 31.1" (789 mm) 1%
295/35R23 31.1" (790 mm) 1.2%
325/40R21 31.2" (793 mm) 1.5%
295/40R22 31.3" (795 mm) 1.8%
265/45R22 31.4" (797 mm) 2%
305/35R23 31.4" (798 mm) 2.2%
305/40R22 31.6" (803 mm) 2.8%
275/40R23 31.7" (804 mm) 2.9%