285/40R21 in Inches

Tire size 285/40R21 refers to the tire size in numbers and letters such as the first number “285” indicates the tire width in millimeters, the second number “40” indicates the aspect ratio of the tire and the last number indicates the diameter of the tire. A 285/40R21 tire in inches can be described as a tire with a width of about 11.2 inches, a sidewall height of about 4.5 inches, and it fits on a 21-inch wheel.

Converting 285/40R21 in Inches

285/40R21 inches mm
Tire Diameter 30 inches 761 mm
Tread Width 11.2 inches 285 mm
Rim Diameter 21 inches 533 mm
Sidewall Height 4.5 inches 114 mm
Circumference 94.2 inches 2390 mm
Revolutions 673 per mile 418 per km

Tire Size Calculator

The Tire Size Calculator is a convenient online tool that helps determine the correct tire dimensions for a vehicle, ensuring optimal performance and compatibility.

Tire Diameter
Tread Width
Rim Diameter
Sidewall Height
Circumference
Revolutions

285/40R21 Alternate Tire Size

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%

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