245/40R21 Tire Size in Inches

245/40R21 is a metric tire size representation, which defines that the tires have a width of 245 mm, 40 is the aspect ratio and a rim diameter of 21 inches. In the imperial system the tire size 245/40R21 equates to a 28.7×9.6R21 that is commonly used in the automotive industry. So Converting 245/40R21 in inches the tires have a length of 28.7 inches, a width of 9.6 inches, a sidewall height of 3.9 inches and The number of complete resolutions made by the corresponding tire size is equal to 703 per mile with a circumference of 90.1 inches.

245/40R21 tire size in inches

245/40R21inchesmm
Tire Diameter28.7 inches729 mm
Tread Width9.6 inches245 mm
Rim Diameter21 inches533 mm
Sidewall Height3.9 inches98 mm
Circumference90.1 inches2289 mm
Revolutions703 per mile437 per km

Tire Size Calculator

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245/40R21 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 245/40R21 tires.

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%

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