245/40R21 Tires

245/40R21 Conversion

When converted to inches, 245/40R21 is equivalent to 28.7x9.6R21.

245/40R21 tire has a section width of 9.6 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 3.9 inches (98 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 28.7 inches (729 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 90.1 inches (2289.1 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. 245/40R21 tire makes 703 revolutions per mile (437 revolutions per kilometer).

245/40R21 Section Width
9.6"
28.7"
245/40R21 Tire Side
Tire Circumference
90.1"
21"
3.9"
703 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 729 mm 28.7"
Tread Width 245 mm 9.6"
Rim Diameter 533.4 mm 21"
Sidewall Height 98 mm 3.9"
Circumference 2289.1 mm 90.1"
Revolutions 437 per km 703 per mile

245/40R21 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 245/40R21 tire can be replaced with 30 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
355/25R21 28" (711 mm) -2.5%
305/25R22 28" (711 mm) -2.5%
295/30R21 28" (711 mm) -2.5%
255/35R21 28" (711 mm) -2.5%
255/30R22 28.1" (713 mm) -2.2%
265/25R23 28.2" (716 mm) -1.8%
315/25R22 28.2" (717 mm) -1.6%
305/30R21 28.2" (717 mm) -1.6%
265/30R22 28.3" (719 mm) -1.4%
265/35R21 28.3" (719 mm) -1.4%
315/30R21 28.5" (723 mm) -0.8%
275/30R22 28.5" (725 mm) -0.5%
275/35R21 28.5" (725 mm) -0.5%
335/25R22 28.6" (727 mm) -0.3%
325/30R21 28.7" (729 mm) 0%
245/35R22 28.8" (731 mm) 0.3%
285/30R22 28.8" (731 mm) 0.3%
285/35R21 28.9" (733 mm) 0.5%
305/25R23 29" (736 mm) 1%
295/30R22 29" (737 mm) 1.1%
255/40R21 29" (737 mm) 1.1%
255/35R22 29" (737 mm) 1.1%
295/35R21 29.1" (739 mm) 1.4%
315/25R23 29.2" (742 mm) 1.8%
305/30R22 29.3" (743 mm) 1.9%
265/40R21 29.3" (745 mm) 2.2%
265/35R22 29.3" (745 mm) 2.2%
235/45R21 29.3" (745 mm) 2.2%
305/35R21 29.4" (747 mm) 2.5%
315/30R22 29.5" (749 mm) 2.7%