Tire Size Conversion
275/55r20 to inches
Precise conversion of tire size 275/55r20: 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
151.3 mm
5.95" (55% of width)
Wheel (rim) diameter
20"
508.0 mm
Overall diameter
31.91"
810.5 mm
Circumference
100.25"
2546.3 mm
Revolutions per mile/km
632 revs/mile
393 revs/km
About 275/55r20 tire size
The size 275/55r20 indicates a section width of 275 mm (10.83 inches), an aspect ratio of 55% (sidewall height 151.3 mm or 5.95 inches), and a 20-inch wheel. Overall diameter calculates to 31.91 inches (810.5 mm), with circumference 100.25 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 275/55r20 with other popular tire sizes to find the perfect fit for your vehicle.