315/30R21 Tires

315/30R21 Conversion

When converted to inches, 315/30R21 is equivalent to 28.5x12.4R21.

315/30R21 tire has a section width of 12.4 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 3.7 inches (95 mm) is the measurement from the wheel rim to top of the tire tread. Overall diameter of 28.5 inches (723 mm) reflects the outer diameter of the tire and stands for tire height. Circumference of 89.5 inches (2270.2 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. 315/30R21 tire makes 708 revolutions per mile (440 revolutions per kilometer).

315/30R21 Section Width
12.4"
28.5"
315/30R21 Tire Side
Tire Circumference
89.5"
21"
3.7"
708 Revs/Mile
Metric Inches
Overall Diameter (Tire Height) 723 mm 28.5"
Tread Width 315 mm 12.4"
Rim Diameter 533.4 mm 21"
Sidewall Height 95 mm 3.7"
Circumference 2270.2 mm 89.5"
Revolutions 440 per km 708 per mile

315/30R21 Replacement Tire Sizes

Replacement tires have to be within 3% of the original tire's overall diameter. 315/30R21 tire can be replaced with 29 compatible tire sizes. Select optional plus size to see its specs.

Tire Size Overall Diameter Difference
245/35R21 27.8" (705 mm) -2.5%
285/30R21 27.8" (705 mm) -2.5%
245/30R22 27.8" (707 mm) -2.2%
295/25R22 27.8" (707 mm) -2.2%
305/25R22 28" (711 mm) -1.7%
295/30R21 28" (711 mm) -1.7%
355/25R21 28" (711 mm) -1.7%
255/35R21 28" (711 mm) -1.7%
255/30R22 28.1" (713 mm) -1.4%
265/25R23 28.2" (716 mm) -1%
305/30R21 28.2" (717 mm) -0.8%
315/25R22 28.2" (717 mm) -0.8%
265/35R21 28.3" (719 mm) -0.6%
265/30R22 28.3" (719 mm) -0.6%
275/35R21 28.5" (725 mm) 0.3%
275/30R22 28.5" (725 mm) 0.3%
335/25R22 28.6" (727 mm) 0.6%
245/40R21 28.7" (729 mm) 0.8%
325/30R21 28.7" (729 mm) 0.8%
245/35R22 28.8" (731 mm) 1.1%
285/30R22 28.8" (731 mm) 1.1%
285/35R21 28.9" (733 mm) 1.4%
305/25R23 29" (736 mm) 1.8%
295/30R22 29" (737 mm) 1.9%
255/35R22 29" (737 mm) 1.9%
255/40R21 29" (737 mm) 1.9%
295/35R21 29.1" (739 mm) 2.2%
315/25R23 29.2" (742 mm) 2.6%
305/30R22 29.3" (743 mm) 2.8%