305/55R20 Tire Size: Dimensions & Inches
305/55R20 is approximately 33.21 inches tall and 12.01 inches wide, with a calculated sidewall height of 6.6 inches.
305/55R20 Dimensions
What Does 305/55R20 Mean?
The tire-size code describes the tire's nominal width, sidewall proportion, construction and wheel diameter:
305/55R20 in Inches
A 305/55R20 tire has a nominal width of 305 mm (about 12.01 inches). Its calculated sidewall is about 6.6 inches, producing an overall diameter of about 33.21 inches.
| Tire size | 305/55R20 |
|---|---|
| Width | 305 mm / 12.01 in |
| Aspect ratio | 55% |
| Overall diameter | 33.21 in |
| Sidewall height | 6.6 in |
| Wheel diameter | 20 in |
| Circumference | 104.33 in |
| Approx. revs per mile | 607 |
Is 305/55R20 a 33-Inch Tire?
Yes, approximately. A 305/55R20 tire has a calculated overall diameter of about 33.21 inches, so it is commonly grouped with 33-inch-class tires. Actual mounted diameter can vary slightly by tire manufacturer, tread design, approved rim width, load and inflation pressure.
Compare 305/55R20 With Another Tire Size
Check diameter, width, sidewall and speedometer differences before considering a different size.
Related 20-Inch Tire Sizes
305/55R20 FAQ
How tall is a 305/55R20 tire?
The calculated overall diameter is about 33.21 inches.
Is 305/55R20 a 33-inch tire?
Approximately. Its calculated diameter is about 33.21 inches, so it is commonly grouped with 33-inch-class tires. Actual mounted dimensions vary by tire model and manufacturer.
How wide is a 305/55R20 tire?
The nominal section width is 305 mm, which is about 12.01 inches.
What wheel diameter does 305/55R20 use?
This size is designed around a 20-inch wheel diameter. Wheel width and full vehicle fitment still need to be checked separately.