275/40R21 Tires

275/40R21 Conversion

When converted to inches, 275/40R21 is equivalent to 29.6x10.8R21.

275/40R21 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 4.3 inches (110 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 29.6 inches (753 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 92.9 inches (2364.4 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. 275/40R21 tire makes 682 revolutions per mile (423 revolutions per kilometer).

275/40R21 Section Width
10.8"
29.6"
275/40R21 Tire Side
Tire Circumference
92.9"
21"
4.3"
682 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 753 mm 29.6"
Tread Width 275 mm 10.8"
Rim Diameter 533.4 mm 21"
Sidewall Height 110 mm 4.3"
Circumference 2364.4 mm 92.9"
Revolutions 423 per km 682 per mile

275/40R21 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 275/40R21 tire can be replaced with 28 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
245/35R22 28.8" (731 mm) -2.9%
285/30R22 28.8" (731 mm) -2.9%
285/35R21 28.9" (733 mm) -2.7%
305/25R23 29" (736 mm) -2.3%
295/30R22 29" (737 mm) -2.1%
255/35R22 29" (737 mm) -2.1%
255/40R21 29" (737 mm) -2.1%
295/35R21 29.1" (739 mm) -1.9%
315/25R23 29.2" (742 mm) -1.5%
305/30R22 29.3" (743 mm) -1.3%
265/40R21 29.3" (745 mm) -1.1%
265/35R22 29.3" (745 mm) -1.1%
235/45R21 29.3" (745 mm) -1.1%
305/35R21 29.4" (747 mm) -0.8%
315/30R22 29.5" (749 mm) -0.5%
275/35R22 29.6" (751 mm) -0.3%
245/45R21 29.6" (753 mm) 0%
315/35R21 29.6" (753 mm) 0%
285/35R22 29.9" (759 mm) 0.8%
285/40R21 30" (761 mm) 1.1%
295/30R23 30" (762 mm) 1.2%
255/45R21 30" (763 mm) 1.3%
255/40R22 30" (763 mm) 1.3%
295/35R22 30.1" (765 mm) 1.6%
295/40R21 30.3" (769 mm) 2.1%
265/45R21 30.4" (771 mm) 2.4%
265/40R22 30.4" (771 mm) 2.4%
305/35R22 30.4" (773 mm) 2.7%