285/40R21 Tire Size in Inches

285/40R21 is a metric tire size representation, which defines that the tires have a width of 285 mm, 40 is the aspect ratio and a rim diameter of 21 inches. In the imperial system the tire size 285/40R21 equates to a 30×11.2R21 that is commonly used in the automotive industry. So Converting 285/40R21 in inches the tires have a length of 30 inches, a width of 11.2 inches, a sidewall height of 4.5 inches and The number of complete resolutions made by the corresponding tire size is equal to 673 per mile with a circumference of 94.2 inches.

285/40R21 tire size in inches

285/40R21inchesmm
Tire Diameter30 inches761 mm
Tread Width11.2 inches285 mm
Rim Diameter21 inches533 mm
Sidewall Height4.5 inches114 mm
Circumference94.2 inches2390 mm
Revolutions673 per mile418 per km

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285/40R21 Equivalent Tire Sizes for replacement

If you are replacing your tires, always keep in mind that they are compatible with your vehicle so that the impact on the overall performance of your vehicle can be reduced. Here we have listed some tire size that is equivalent to 285/40R21 tires.

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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