Tire Size Conversion
275/70r18 to inches
Precise conversion of tire size 275/70r18: section width, sidewall height, overall diameter, circumference, and revolutions per mile. Includes exact mm ↔ inches results and quick guidance.
Section width
275 mm
10.83 inches
Sidewall height
192.5 mm
7.58" (70% of width)
Wheel (rim) diameter
18"
457.2 mm
Overall diameter
33.16"
842.2 mm
Circumference
104.17"
2645.8 mm
Revolutions per mile/km
608 revs/mile
378 revs/km
About 275/70r18 tire size
The size 275/70r18 indicates a section width of 275 mm (10.83 inches), an aspect ratio of 70% (sidewall height 192.5 mm or 7.58 inches), and a 18-inch wheel. Overall diameter calculates to 33.16 inches (842.2 mm), with circumference 104.17 inches.
Use these measurements to estimate speedometer error and clearance changes when switching sizes. For multi-size comparison and speed error calculation, try our dedicated tire size calculator.
Common tire sizes
Compare 275/70r18 with other popular tire sizes to find the perfect fit for your vehicle.