255/30R21 in Inches

Tire size 255/30R21 refers to the tire size in numbers and letters such as the first number “255” indicates the tire width in millimeters, the second number “30” indicates the aspect ratio of the tire and the last number indicates the diameter of the tire. A 255/30R21 tire in inches can be described as a tire with a width of about 10 inches, a sidewall height of about 3 inches, and it fits on a 21-inch wheel.

Converting 255/30R21 in Inches

255/30R21 inches mm
Tire Diameter 27 inches 687 mm
Tread Width 10 inches 255 mm
Rim Diameter 21 inches 533 mm
Sidewall Height 3 inches 77 mm
Circumference 84.8 inches 2157 mm
Revolutions 747 per mile 464 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

255/30R21 Alternate Tire Size

Tire Size Overall Diameter Difference
275/25R21 26.4″ (671 mm) -2.3%
235/30R21 26.6″ (675 mm) -1.7%
295/25R21 26.8″ (681 mm) -0.9%
245/30R21 26.8″ (681 mm) -0.9%
375/20R21 26.9″ (683 mm) -0.6%
305/25R21 27″ (685 mm) -0.3%
265/25R22 27.2″ (691 mm) 0.6%
265/30R21 27.3″ (693 mm) 0.9%
225/30R22 27.4″ (695 mm) 1.2%
325/25R21 27.4″ (695 mm) 1.2%
235/35R21 27.4″ (697 mm) 1.5%
275/25R22 27.4″ (697 mm) 1.5%
275/30R21 27.5″ (699 mm) 1.7%
235/30R22 27.6″ (701 mm) 2%
285/25R22 27.6″ (701 mm) 2%
285/30R21 27.8″ (705 mm) 2.6%
245/35R21 27.8″ (705 mm) 2.6%
295/25R22 27.8″ (707 mm) 2.9%
245/30R22 27.8″ (707 mm) 2.9%

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