275/45R21 Tire Size in Inches

275/45R21 is a metric tire size representation, which defines that the tires have a width of 275 mm, 45 is the aspect ratio and a rim diameter of 21 inches. In the imperial system the tire size 275/45R21 equates to a 30.7×10.8R21 that is commonly used in the automotive industry. So Converting 275/45R21 in inches the tires have a length of 30.7 inches, a width of 10.8 inches, a sidewall height of 4.9 inches and The number of complete resolutions made by the corresponding tire size is equal to 657 per mile with a circumference of 96.4 inches.

275/45R21 tire size in inches

275/45R21inchesmm
Tire Diameter30.7 inches781 mm
Tread Width10.8 inches275 mm
Rim Diameter21 inches533 mm
Sidewall Height4.9 inches124 mm
Circumference96.4 inches2452 mm
Revolutions657 per mile408 per km

Tire Size Calculator

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275/45R21 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 275/45R21 tires.

Tire Size Overall Diameter Difference
285/35R22 29.9″ (759 mm) -2.8%
285/40R21 30″ (761 mm) -2.6%
295/30R23 30″ (762 mm) -2.4%
255/40R22 30″ (763 mm) -2.3%
255/45R21 30″ (763 mm) -2.3%
295/35R22 30.1″ (765 mm) -2%
295/40R21 30.3″ (769 mm) -1.5%
265/45R21 30.4″ (771 mm) -1.3%
265/40R22 30.4″ (771 mm) -1.3%
305/35R22 30.4″ (773 mm) -1%
275/40R22 30.7″ (779 mm) -0.3%
315/35R22 30.7″ (779 mm) -0.3%
325/30R23 30.7″ (780 mm) -0.1%
285/35R23 30.9″ (784 mm) 0.4%
315/40R21 30.9″ (785 mm) 0.5%
325/35R22 31″ (787 mm) 0.8%
285/40R22 31″ (787 mm) 0.8%
255/45R22 31.1″ (789 mm) 1%
285/45R21 31.1″ (789 mm) 1%
255/50R21 31.1″ (789 mm) 1%
295/35R23 31.1″ (790 mm) 1.2%
325/40R21 31.2″ (793 mm) 1.5%
295/40R22 31.3″ (795 mm) 1.8%
265/45R22 31.4″ (797 mm) 2%
305/35R23 31.4″ (798 mm) 2.2%
305/40R22 31.6″ (803 mm) 2.8%
275/40R23 31.7″ (804 mm) 2.9%

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