305/25R21 in Inches

Tire size 305/25R21 refers to the tire size in numbers and letters such as the first number “305” indicates the tire width in millimeters, the second number “25” indicates the aspect ratio of the tire and the last number indicates the diameter of the tire. A 305/25R21 tire in inches can be described as a tire with a width of about 12 inches, a sidewall height of about 3 inches, and it fits on a 21-inch wheel.

Converting 305/25R21 in Inches

305/25R21 inches mm
Tire Diameter 27 inches 685 mm
Tread Width 12 inches 305 mm
Rim Diameter 21 inches 533 mm
Sidewall Height 3 inches 76 mm
Circumference 84.8 inches 2151 mm
Revolutions 747 per mile 465 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

305/25R21 Alternate Tire Size

Tire Size Overall Diameter Difference
275/25R21 26.4″ (671 mm) -2%
235/30R21 26.6″ (675 mm) -1.5%
295/25R21 26.8″ (681 mm) -0.6%
245/30R21 26.8″ (681 mm) -0.6%
375/20R21 26.9″ (683 mm) -0.3%
255/30R21 27″ (687 mm) 0.3%
265/25R22 27.2″ (691 mm) 0.9%
265/30R21 27.3″ (693 mm) 1.2%
325/25R21 27.4″ (695 mm) 1.5%
225/30R22 27.4″ (695 mm) 1.5%
235/35R21 27.4″ (697 mm) 1.8%
275/25R22 27.4″ (697 mm) 1.8%
275/30R21 27.5″ (699 mm) 2%
285/25R22 27.6″ (701 mm) 2.3%
235/30R22 27.6″ (701 mm) 2.3%
245/35R21 27.8″ (705 mm) 2.9%
285/30R21 27.8″ (705 mm) 2.9%

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