255/40R21 Tire Size in Inches

255/40R21 is a metric tire size representation, which defines that the tires have a width of 255 mm, 40 is the aspect ratio and a rim diameter of 21 inches. In the imperial system the tire size 255/40R21 equates to a 29×10R21 that is commonly used in the automotive industry. So Converting 255/40R21 in inches the tires have a length of 29 inches, a width of 10 inches, a sidewall height of 4 inches and The number of complete resolutions made by the corresponding tire size is equal to 695 per mile with a circumference of 91.1 inches.

255/40R21 tire size in inches

255/40R21inchesmm
Tire Diameter29 inches737 mm
Tread Width10 inches255 mm
Rim Diameter21 inches533 mm
Sidewall Height4 inches102 mm
Circumference91.1 inches2314 mm
Revolutions695 per mile432 per km

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255/40R21 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 255/40R21 tires.

Tire Size Overall Diameter Difference
265/25R23 28.2″ (716 mm) -2.8%
305/30R21 28.2″ (717 mm) -2.7%
315/25R22 28.2″ (717 mm) -2.7%
265/35R21 28.3″ (719 mm) -2.4%
265/30R22 28.3″ (719 mm) -2.4%
315/30R21 28.5″ (723 mm) -1.9%
275/35R21 28.5″ (725 mm) -1.6%
275/30R22 28.5″ (725 mm) -1.6%
335/25R22 28.6″ (727 mm) -1.4%
325/30R21 28.7″ (729 mm) -1.1%
245/40R21 28.7″ (729 mm) -1.1%
245/35R22 28.8″ (731 mm) -0.8%
285/30R22 28.8″ (731 mm) -0.8%
285/35R21 28.9″ (733 mm) -0.5%
305/25R23 29″ (736 mm) -0.1%
255/35R22 29″ (737 mm) 0%
295/30R22 29″ (737 mm) 0%
295/35R21 29.1″ (739 mm) 0.3%
315/25R23 29.2″ (742 mm) 0.7%
305/30R22 29.3″ (743 mm) 0.8%
235/45R21 29.3″ (745 mm) 1.1%
265/40R21 29.3″ (745 mm) 1.1%
265/35R22 29.3″ (745 mm) 1.1%
305/35R21 29.4″ (747 mm) 1.4%
315/30R22 29.5″ (749 mm) 1.6%
275/35R22 29.6″ (751 mm) 1.9%
315/35R21 29.6″ (753 mm) 2.2%
245/45R21 29.6″ (753 mm) 2.2%
275/40R21 29.6″ (753 mm) 2.2%
285/35R22 29.9″ (759 mm) 3%

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