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245/65R18 Tire Size
All You Need to Know About 245/65R18 Tires
245/65R18 tires have a section width of 245 millimeters (mm), an aspect ratio of 65%, radial construction, and an 18-inch wheel diameter. Before buying tires sized 245/65R18, converting 245/65R18 size in inches, comparing them with other tire sizes like 255/55R18 and 235/65R18, and researching the best 245/65R18 tires helps drivers shop for the right set for their vehicles.
What Are The Dimensions of 245/65R18 Tires in Inches?
245/65R18 tires have a section width of 9.65 inches (≈ 9.6"), a sidewall height of 6.27 inches (≈ 6.3"), and a wheel diameter of 18 inches.
The overall tire diameter of 245/65R18 tires is 30.54 inches (≈ 30.5"), the circumference is 95.94" (≈ 95.9"), and the recommended rim width range is 7.0 to 8.5 inches.
The 245/65R18 tire size in millimeters and inches is presented in the below table:
245/65R18 Tire Size Dimensions | 245/65R18 Tire Size Dimensions in Inches (") | Formula to Convert 245/65R18 Size in Inches (") |
245 mm (section width) | 9.65" (≈ 9.6") | 245 ÷ 25.4 = 9.65 |
159.25 mm (sidewall height) | 6.27" (≈ 6.3") | (245 × 0.65) ÷ 25.4 = 6.27 |
18 (rim diameter) | 18" | Given |
775.70 mm (overall diameter) | 30.54" (≈ 30.5") | (2 × 159.25 ÷ 25.4) + 18 = 30.54 |
2437.90 mm (circumference) | 95.94" (≈ 95.9") | 30.54 × 3.1416 = 95.94 |
387.85 mm (radius) | 15.27" (≈ 15.3") | 30.54 ÷ 2 = 15.27 |
In inches, the 245/65R18 tire size can be represented as 30.5" × 9.6" R18.
How tall is a 245/65/18 tire?
A 245/65R18 tire is approximately 30.5 inches tall.
Comparison of 245/65R18 With Other Tire Sizes
Compare 245/65R18 with other tire sizes, such as 255/55R18 and 235/65R18, to understand the key differences and make the right choice when buying new tires.
What Is The Difference Between 245/65R18 vs 255/55R18?
The main differences between 245/65R18 and 255/55R18 are the section width and sidewall height. The 245/65R18 tire is ≈ 0.4" (≈ 10 mm) narrower than the 255/55R18 tire. Also, the 245/65R18 size has a ≈ 0.8" (≈ 19 mm) taller sidewall height and ≈ 1.5" (≈ 38 mm) larger overall diameter than the 255/55R18 size.
The tire dimensions or measurement difference between 245/65R18 vs 255/55R18 is shown in the below table.
Tire dimensions | 245/65R18 tires dimensions in millimetre (mm) and inches (") | 255/55R18 tires dimensions in millimetre (mm) and inches (") | Difference b/w 245/65R18 and 255/55R18 in millimetre (mm) and inches (") | Percentage ≈ difference b/w 245/65R18 and 255/55R18 |
Section Width | 245 mm (≈ 9.65") | 255 mm (≈ 10.04") | 10 mm (≈ 0.39") | ≈ 4.1% |
Sidewall Height | 159.25 mm (≈ 6.27") | 140.25 mm (≈ 5.52") | 19.00 mm (≈ 0.75") | ≈ 11.9% |
Overall Diameter | 775.70 mm (≈ 30.54") | 737.70 mm (≈ 29.04") | 38.00 mm (≈ 1.50") | ≈ 4.9% |
Circumference | 2437.90 mm (≈ 95.94") | 2317.90 mm (≈ 91.24") | 120.00 mm (≈ 4.72") | ≈ 4.9% |
Radius | 387.85 mm (≈ 15.27") | 368.85 mm (≈ 14.52") | 19.00 mm (≈ 0.75") | ≈ 4.9% |
Rim Diameter | 457.2 mm (18.00") | 457.2 mm (18.00") | - | - |
Rim width range | 7.0’’- 8.5’’ | 7.0’’- 9.0’’ | - | - |
Can I use 255/55R18 instead of 245/65R18?
No, switching from 245/65R18 to 255/55R18 is not recommended, even if they fit the same 18 rim. The new 255/55R18 tire is 1.5 inches (4.9%) shorter than the original 245/65, which exceeds the safe industry tolerance of 3%.Here is why it’s a bad fit:
-The 4.9% size drop causes wheels to spin faster than the computer expects, causing dashboard error lights or safety malfunctions.
-Your speedometer will read significantly higher than your actual speed.
-You lose roughly 0.75 inches of ride height. This can lead to scraping on speed bumps or reduced capability in snow and off-road conditions.
-The shorter sidewall (the "55" vs the "65") provides less "cushion," resulting in a stiffer, harsher ride over potholes and rough roads.
If you want a wider tire than 245/65R18 that is actually safe to use, consider a 255/60R18 or 265/60R18. These stay within a safe 1.6% variance of your original height.
What Is The Difference Between 245/65R18 vs 235/65R18?
The main difference between 245/65R18 and 235/65R18 is the section width. The 245/65R18 tire is ≈ 0.4" (≈ 10 mm) wider than the 235/65R18 tire, resulting in ≈ 0.3" (≈ 6.5 mm) taller sidewall height and a ≈ 0.5" (≈ 13 mm) larger overall diameter.
The tire dimensions or measurement difference between 245/65R18 vs 235/65R18 is shown in the below table.
Tire dimensions | 245/65R18 tires dimensions in millimetre (mm) and inches (") | 235/65R18 tires dimensions in millimetre (mm) and inches (") | Difference b/w 245/65R18 and 235/65R18 in millimetre (mm) and inches (") | Percentage ≈ difference b/w 245/65R18 and 235/65R18 |
Section Width | 245 mm (≈ 9.65") | 235 mm (≈ 9.25") | 10 mm (≈ 0.39") | ≈ 4.3% |
Sidewall Height | 159.25 mm (≈ 6.27") | 152.75 mm (≈ 6.01") | 6.50 mm (≈ 0.26") | ≈ 4.3% |
Overall Diameter | 775.70 mm (≈ 30.54") | 762.70 mm (≈ 30.03") | 13.00 mm (≈ 0.51") | ≈ 1.7% |
Circumference | 2437.90 mm (≈ 95.94") | 2395.60 mm (≈ 94.33") | 42.30 mm (≈ 1.67") | ≈ 1.7% |
Radius | 387.85 mm (≈ 15.27") | 381.35 mm (≈ 15.01") | 6.50 mm (≈ 0.26") | ≈ 1.7% |
Rim Diameter | 457.2 mm (18.00") | 457.2 mm (18.00") | - | - |
Rim width range | 7.0’’- 8.5’’ | 6.5’’- 8.5’’ | - | - |
Can I use 235/65R18 instead of 245/65R18?
Yes, using 235/65R18 instead of 245/65R18 is a safe and compatible swap. The 235/65R18 is a functional alternative to the 245/65R18 because the dimensions are nearly identical. The 235/65R18 is 0.51 inches shorter in total diameter. This results in a slight 0.25-inch drop in ground clearance. Also, the 235/65R18 tire is 10mm (approx. 0.4") narrower. This reduces the "footprint" of the tire slightly compared to the original 245/65, which can marginally improve fuel efficiency and snow traction, though it offers slightly less dry-pavement grip.
Recommended 235/65R18 Tires
If you plan to switch to 235/65R18 instead of 245/65R18, well-regarded options in this size include:
All You Need to Know About 245/65R18 Tires
245/65R18 tires have a section width of 245 millimeters (mm), an aspect ratio of 65%, radial construction, and an 18-inch wheel diameter. Before buying tires sized 245/65R18, converting 245/65R18 size in inches, comparing them with other tire sizes like 255/55R18 and 235/65R18, and researching the best 245/65R18 tires helps drivers shop for the right set for their vehicles.
What Are The Dimensions of 245/65R18 Tires in Inches?
245/65R18 tires have a section width of 9.65 inches (≈ 9.6"), a sidewall height of 6.27 inches (≈ 6.3"), and a wheel diameter of 18 inches.
The overall tire diameter of 245/65R18 tires is 30.54 inches (≈ 30.5"), the circumference is 95.94" (≈ 95.9"), and the recommended rim width range is 7.0 to 8.5 inches.
The 245/65R18 tire size in millimeters and inches is presented in the below table:
245/65R18 Tire Size Dimensions | 245/65R18 Tire Size Dimensions in Inches (") | Formula to Convert 245/65R18 Size in Inches (") |
245 mm (section width) | 9.65" (≈ 9.6") | 245 ÷ 25.4 = 9.65 |
159.25 mm (sidewall height) | 6.27" (≈ 6.3") | (245 × 0.65) ÷ 25.4 = 6.27 |
18 (rim diameter) | 18" | Given |
775.70 mm (overall diameter) | 30.54" (≈ 30.5") | (2 × 159.25 ÷ 25.4) + 18 = 30.54 |
2437.90 mm (circumference) | 95.94" (≈ 95.9") | 30.54 × 3.1416 = 95.94 |
387.85 mm (radius) | 15.27" (≈ 15.3") | 30.54 ÷ 2 = 15.27 |
In inches, the 245/65R18 tire size can be represented as 30.5" × 9.6" R18.
How tall is a 245/65/18 tire?
A 245/65R18 tire is approximately 30.5 inches tall.
Comparison of 245/65R18 With Other Tire Sizes
Compare 245/65R18 with other tire sizes, such as 255/55R18 and 235/65R18, to understand the key differences and make the right choice when buying new tires.
What Is The Difference Between 245/65R18 vs 255/55R18?
The main differences between 245/65R18 and 255/55R18 are the section width and sidewall height. The 245/65R18 tire is ≈ 0.4" (≈ 10 mm) narrower than the 255/55R18 tire. Also, the 245/65R18 size has a ≈ 0.8" (≈ 19 mm) taller sidewall height and ≈ 1.5" (≈ 38 mm) larger overall diameter than the 255/55R18 size.
The tire dimensions or measurement difference between 245/65R18 vs 255/55R18 is shown in the below table.
Tire dimensions | 245/65R18 tires dimensions in millimetre (mm) and inches (") | 255/55R18 tires dimensions in millimetre (mm) and inches (") | Difference b/w 245/65R18 and 255/55R18 in millimetre (mm) and inches (") | Percentage ≈ difference b/w 245/65R18 and 255/55R18 |
Section Width | 245 mm (≈ 9.65") | 255 mm (≈ 10.04") | 10 mm (≈ 0.39") | ≈ 4.1% |
Sidewall Height | 159.25 mm (≈ 6.27") | 140.25 mm (≈ 5.52") | 19.00 mm (≈ 0.75") | ≈ 11.9% |
Overall Diameter | 775.70 mm (≈ 30.54") | 737.70 mm (≈ 29.04") | 38.00 mm (≈ 1.50") | ≈ 4.9% |
Circumference | 2437.90 mm (≈ 95.94") | 2317.90 mm (≈ 91.24") | 120.00 mm (≈ 4.72") | ≈ 4.9% |
Radius | 387.85 mm (≈ 15.27") | 368.85 mm (≈ 14.52") | 19.00 mm (≈ 0.75") | ≈ 4.9% |
Rim Diameter | 457.2 mm (18.00") | 457.2 mm (18.00") | - | - |
Rim width range | 7.0’’- 8.5’’ | 7.0’’- 9.0’’ | - | - |
Can I use 255/55R18 instead of 245/65R18?
No, switching from 245/65R18 to 255/55R18 is not recommended, even if they fit the same 18 rim. The new 255/55R18 tire is 1.5 inches (4.9%) shorter than the original 245/65, which exceeds the safe industry tolerance of 3%.Here is why it’s a bad fit:
-The 4.9% size drop causes wheels to spin faster than the computer expects, causing dashboard error lights or safety malfunctions.
-Your speedometer will read significantly higher than your actual speed.
-You lose roughly 0.75 inches of ride height. This can lead to scraping on speed bumps or reduced capability in snow and off-road conditions.
-The shorter sidewall (the "55" vs the "65") provides less "cushion," resulting in a stiffer, harsher ride over potholes and rough roads.
If you want a wider tire than 245/65R18 that is actually safe to use, consider a 255/60R18 or 265/60R18. These stay within a safe 1.6% variance of your original height.
What Is The Difference Between 245/65R18 vs 235/65R18?
The main difference between 245/65R18 and 235/65R18 is the section width. The 245/65R18 tire is ≈ 0.4" (≈ 10 mm) wider than the 235/65R18 tire, resulting in ≈ 0.3" (≈ 6.5 mm) taller sidewall height and a ≈ 0.5" (≈ 13 mm) larger overall diameter.
The tire dimensions or measurement difference between 245/65R18 vs 235/65R18 is shown in the below table.
Tire dimensions | 245/65R18 tires dimensions in millimetre (mm) and inches (") | 235/65R18 tires dimensions in millimetre (mm) and inches (") | Difference b/w 245/65R18 and 235/65R18 in millimetre (mm) and inches (") | Percentage ≈ difference b/w 245/65R18 and 235/65R18 |
Section Width | 245 mm (≈ 9.65") | 235 mm (≈ 9.25") | 10 mm (≈ 0.39") | ≈ 4.3% |
Sidewall Height | 159.25 mm (≈ 6.27") | 152.75 mm (≈ 6.01") | 6.50 mm (≈ 0.26") | ≈ 4.3% |
Overall Diameter | 775.70 mm (≈ 30.54") | 762.70 mm (≈ 30.03") | 13.00 mm (≈ 0.51") | ≈ 1.7% |
Circumference | 2437.90 mm (≈ 95.94") | 2395.60 mm (≈ 94.33") | 42.30 mm (≈ 1.67") | ≈ 1.7% |
Radius | 387.85 mm (≈ 15.27") | 381.35 mm (≈ 15.01") | 6.50 mm (≈ 0.26") | ≈ 1.7% |
Rim Diameter | 457.2 mm (18.00") | 457.2 mm (18.00") | - | - |
Rim width range | 7.0’’- 8.5’’ | 6.5’’- 8.5’’ | - | - |
Can I use 235/65R18 instead of 245/65R18?
Yes, using 235/65R18 instead of 245/65R18 is a safe and compatible swap. The 235/65R18 is a functional alternative to the 245/65R18 because the dimensions are nearly identical. The 235/65R18 is 0.51 inches shorter in total diameter. This results in a slight 0.25-inch drop in ground clearance. Also, the 235/65R18 tire is 10mm (approx. 0.4") narrower. This reduces the "footprint" of the tire slightly compared to the original 245/65, which can marginally improve fuel efficiency and snow traction, though it offers slightly less dry-pavement grip.
Recommended 235/65R18 Tires
If you plan to switch to 235/65R18 instead of 245/65R18, well-regarded options in this size include:
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