What Size Tire Is 305/55r20 In Inches?
What size tire is 305/55R20 in Inches?
- Diameter of the tire: Approximately 33.22 inches or 843.7 mm
- Tire width: Approximately 12.01 inches
- Sidewall height: Approximately 6.61 inches (calculated as a percentage of the tire’s width, which is 55% in this case)
- Diameter of the wheel: 20 inches
Detailed Explanation:
Here’s a detailed explanation of tire size 305/55R20 in inches:
The tire size 305/55R20 refers to a tire with a width of 305 millimeters, an aspect ratio (or sidewall height as a percentage of the width) of 55%, and a diameter of 20 inches.
Diameter Of The Tire:
To calculate the diameter of the tire, we can use the following formula:
- Diameter = (2 x sidewall height x aspect ratio/100) + wheel diameter (in inches)
First, we need to calculate the sidewall height:
- Sidewall height = width x aspect ratio / 100
- Sidewall height = 305 x 55 / 100 = 167.75 mm
We can then convert the sidewall height to inches:
- Sidewall height = 167.75 mm / 25.4 = 6.61 inches (rounded to the nearest hundredth)
- Now we can calculate the diameter of the tire:
- Diameter = (2 x sidewall height x aspect ratio/100) + wheel diameter (in inches)
- Diameter = (2 x 6.61 x 55/100) + 20
- Diameter = 33.22 inches (rounded to the nearest hundredth)
Tire Width:
To calculate the tire width in inches, we can use the following formula:
- Tire width = width in millimeters x 0.03937 inches/millimeter
- Tire width = 305 x 0.03937 = 12.01 inches (rounded to the nearest hundredth)
Sidewall Height:
- As we calculated earlier, the sidewall height is 6.61 inches.
Diameter Of The Wheel:
- The diameter of the wheel is 20 inches.
Therefore, the 305/55R20 tire has an overall diameter of approximately 33.22 inches, a width of approximately 12.01 inches, a sidewall height of approximately 6.61 inches, and a wheel diameter of 20 inches. Please note that these are approximate measurements, and actual tire sizes can vary slightly depending on the brand and model of the tire.
Tire Height (Diameter) | 33.2 in | 844 mm |
Wheel Size | 20 in | 508 mm |
Sidewall Height | 6.6 in | 168 mm |
Tire Width | 12 in | 305 mm |
Tire Circumference | 104.3 in | 2,650 mm |
Revolutions per Mile | 607.3 | |
Revolutions per Kilometer | 377.4 |
What Does It Mean By 305/55R20?
“305/55R20” refers to a specific tire size typically used in automotive applications. Here’s a breakdown of what each component of the tire size represents:
- 305: This number represents the tire’s section width, which is the tire’s widest point, measured in millimeters. In this case, the tire’s section width is 305 millimeters.
- 55: This number indicates the tire’s aspect ratio, sidewall height ratio, and section width. In this case, the aspect ratio is 55, which means that the tire’s sidewall height is 55% of its section width.
- R: This letter represents the tire’s construction type, where “R” stands for radial, the most common type of tire construction used today. Radial tires have plies that run perpendicular to the tire’s circumference, providing better ride comfort and handling than other types of tire construction.
- 20: This number signifies the tire’s rim diameter, which is the diameter of the wheel that the tire is designed to fit. In this case, the tire is designed to fit a 20-inch rim.
FAQs
What Vehicles Can Use 305/55r20 Tires?
The 305/55R20 tire size is commonly used in larger trucks and SUVs such as the Ford F-150, Chevrolet Silverado, Toyota Tundra, and GMC Sierra.
What Is The Load Rating For A 305/55r20 Tire?
The load rating for a 305/55R20 tire varies depending on the brand and model of the tire. Typically, load ratings for this tire size range from 2,755 lbs to 3,640 lbs per tire.
What Is The Speed Rating For A 305/55r20 Tire?
The speed rating for a 305/55R20 tire varies depending on the brand and model of the tire. Generally, this tire size has a speed rating of either S or T, which means it is rated for speeds up to 112 mph or 118 mph, respectively.
Can I Use A 305/55r20 Tire On A Smaller Rim?
No, using a 305/55R20 tire on a smaller rim is not recommended, as it can compromise the tire’s performance and safety.
What Is The Overall Diameter Of A 305/55r20 Tire?
The overall diameter of a 305/55R20 tire is approximately 33.2 inches or 843mm.
What Are Some Popular Tire Brands That Offer 305/55r20 Tires?
Some popular tire brands that offer 305/55R20 tires include Nitto, Toyo, BF Goodrich, Goodyear, and Michelin.