255/40R21 in Inches

Tire size 255/40R21 refers to the tire size in numbers and letters such as the first number “255” 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 255/40R21 tire in inches can be described as a tire with a width of about 10 inches, a sidewall height of about 4 inches, and it fits on a 21-inch wheel.

Converting 255/40R21 in Inches

255/40R21 inches mm
Tire Diameter 29 inches 737 mm
Tread Width 10 inches 255 mm
Rim Diameter 21 inches 533 mm
Sidewall Height 4 inches 102 mm
Circumference 91.1 inches 2314 mm
Revolutions 695 per mile 432 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

255/40R21 Alternate Tire Size

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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