305/55R20 tire size
305/55R20 in inches: 33.21" overall diameter — 12.01" wide, 6.60" sidewall.
Overall diameter 33.21 in 843.5 mm
Section width 12.01 in 305 mm
Sidewall height 6.60 in 167.75 mm
Revs / mile 607 speedo calibration
Full dimensions
| Measurement | Metric | Imperial |
|---|---|---|
| Overall diameter | 843.5 mm | 33.21 in |
| Section width | 305 mm | 12.01 in |
| Sidewall height | 167.75 mm | 6.60 in |
| Rim diameter | 508 mm | 20 in |
| Circumference | 2649.9 mm | 104.33 in |
| Revolutions per mile | 607.3 | |
| Aspect ratio | 55% | |
Compare 305/55R20 to similar sizes
Frequently asked questions
What is the overall diameter of a 305/55R20 tire?
A 305/55R20 tire has an overall diameter of 33.21 inches (843.5 mm).
How tall is a 305/55R20 tire?
The sidewall height is 167.75 mm (6.60 inches), and the overall diameter from the ground to the top of the tire is 33.21 inches.
How many revolutions per mile does a 305/55R20 tire make?
A 305/55R20 tire makes approximately 607 revolutions per mile. Your speedometer is calibrated to this number.
What rim size does a 305/55R20 tire fit?
A 305/55R20 tire is designed for a 20-inch rim (508 mm).
All dimensions calculated using standard ETRTO formulas. Always confirm fitment with your vehicle's door-placard and a qualified tire professional before purchasing.