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245/40R19 Tire Size
All You Need to Know About 245/40R19 Tires
245/40R19 tires have a section width of 245 millimeters (mm), an aspect ratio of 40%, radial construction, and a 19-inch wheel diameter. Before buying tires sized 245/40R19, converting 245/40R19 size in inches, comparing it with similar tire sizes like 245/45R18 and 235/40R19, and researching the best 245/40R19 tires helps drivers shop for the right set for their vehicles.
Recommended 245/40R19 Tires
Well-regarded options in 245/40R19 size include:
What Are The Dimensions of 245/40R19 Tires in Inches?
245/40R19 tires have a section width of 9.646" (≈ 9.6"), a sidewall height of 3.858" (≈ 3.9"), and a wheel diameter of 19 inches. The overall tire diameter is 26.717" (≈ 26.7"), the circumference is 83.942" (≈ 83.9"), and the recommended rim width range is 8.0 to 9.5 inches.
In inches, the 245/40R19 tire size can be represented as 26.7" × 9.6" R19.
245/40R19 tire size in millimeters and inches is presented in the below table:
245/40R19 Tire Size Dimensions | 245/40R19 Tire Size Dimensions in Inches (") | Formula to Convert 245/40R19 Size in Inches (") |
245 mm (section width) | 9.646" (≈ 9.6") | 245 ÷ 25.4 = 9.646 |
98.00 mm (sidewall height) | 3.858" (≈ 3.9") | (245 × 0.40) ÷ 25.4 = 3.858 |
19 (rim diameter) | 19" | Given |
678.60 mm (overall diameter) | 26.717" (≈ 26.7") | (2 × 98.00 ÷ 25.4) + 19 = 26.717 |
2131.90 mm (circumference) | 83.942" (≈ 83.9") | 26.717 × 3.1416 = 83.942 |
339.30 mm (radius) | 13.358" (≈ 13.4") | 26.717 ÷ 2 = 13.358 |
Comparison of 245/40R19 With Other Tire Sizes
Compare 245/40R19 with other tire sizes, such as 245/45R18 and 235/40R19, to learn the key differences between them and make the right choice when buying new tires.
What Is The Difference Between 245/40R19 vs 245/45R18?
The main difference between 245/40R19 and 245/45R18 is the wheel diameter and sidewall height. The 245/40R19 tire has a 12.25 mm (0.482") shorter sidewall than the 245/45R18, but it uses a 25.40 mm (1.0") larger rim diameter. This results in an overall diameter difference of only 0.90 mm (0.035"), making the 245/40R19 just 0.1% taller. Because the total height is nearly identical, these are excellent 'sister sizes' that will not affect your speedometer or safety systems when swapping between 18-inch and 19-inch wheels.
The tire dimensions or measurement difference between 245/40R19 vs 245/45R18 is shown in the below table.
Tire dimensions | 245/40R19 tires dimensions in millimetre (mm) and inches (") | 245/45R18 tires dimensions in millimetre (mm) and inches (") | Difference b/w 245/40R19 and 245/45R18 in millimetre (mm) and inches (") | Percentage ≈ difference b/w 245/40R19 and 245/45R18 |
Section Width | 245 mm (≈ 9.65") | 245 mm (≈ 9.65") | - | - |
Sidewall Height | 98.00 mm (≈ 3.86") | 110.25 mm (≈ 4.34") | 12.25 mm (≈ 0.48") | ≈ 12.5% |
Overall Diameter | 678.60 mm (≈ 26.72") | 677.70 mm (≈ 26.68") | 0.90 mm (≈ 0.04") | ≈ 0.1% |
Circumference | 2131.90 mm (≈ 83.94") | 2129.07 mm (≈ 83.82") | 2.83 mm (≈ 0.11") | ≈ 0.1% |
Radius | 339.30 mm (≈ 13.36") | 338.85 mm (≈ 13.34") | 0.45 mm (≈ 0.02") | ≈ 0.1% |
Rim Diameter | 482.6 mm (19.00") | 457.2 mm (18.00") | 25.4 mm (≈ 1.00") | ≈ 5.3% |
Rim width range | 8.0’’- 9.5’’ | 7.5’’- 9.0’’ | - | - |
Can I use 245/45R18 instead of 245/40R19?
No, you cannot use a 245/45R18 tire directly on a 19-inch wheel. The tire will not fit the rim; to use a 245/45R18 size, you need to purchase a separate set of 18-inch wheels.
Swapping the entire wheel and tire set from a 19" to an 18" setup is a very common and effective modification for three reasons: identical height (diameter difference is less than 0.1% ), improved comfort (245/45R18 has a 12.25 mm (0.5") taller sidewall, which smooths out the ride on rough roads due to the extra rubber), and cost/durability (18-inch wheels and tires are generally less expensive than 19-inch versions).
If you decide to get 18-inch wheels to use 245/45R18 tires, ensure the new wheels match your car's:
- Bolt Pattern (e.g., 5x114.3)
- Center Bore (the hole in the middle of the wheel)
- Offset (how far the wheel sits in or out)
- Brake Clearance (ensure the smaller 18" wheel fits over your brake calipers)
What Is The Difference Between 245/40R19 vs 235/40R19?
The main difference between 245/40R19 and 235/40R19 is the section width. The 245/40R19 tire is 10 mm (0.39") wider, resulting in a 4.0 mm (0.16") taller sidewall and an 8.0 mm (0.31") larger overall diameter. Both tires generally fit the same 8.0" to 9.5" rim width range, making them easy to swap on the same set of wheels.
The tire dimensions or measurement difference between 245/40R19 vs 235/40R19 is shown in the below table.
Tire dimensions | 245/40R19 tires dimensions in millimetre (mm) and inches (") | 235/40R19 tires dimensions in millimetre (mm) and inches (") | Difference b/w 245/40R19 and 235/40R19 in millimetre (mm) and inches (") | Percentage ≈ difference b/w 245/40R19 and 235/40R19 |
Section Width | 245 mm (≈ 9.65") | 235 mm (≈ 9.25") | 10 mm (≈ 0.39") | ≈ 4.1% |
Sidewall Height | 98.00 mm (≈ 3.86") | 94.00 mm (≈ 3.70") | 4.00 mm (≈ 0.16") | ≈ 4.1% |
Overall Diameter | 678.60 mm (≈ 26.72") | 670.60 mm (≈ 26.40") | 8.00 mm (≈ 0.31") | ≈ 1.2% |
Circumference | 2131.90 mm (≈ 83.94") | 2106.77 mm (≈ 82.94") | 25.13 mm (≈ 0.99") | ≈ 1.2% |
Radius | 339.30 mm (≈ 13.36") | 335.30 mm (≈ 13.20") | 4.00 mm (≈ 0.16") | ≈ 1.2% |
Rim Diameter | 482.6 mm (19.00") | 482.6 mm (19.00") | - | - |
Rim width range | 8.0’’- 9.5’’ | 8.0’’- 9.5’’ | - | - |
Can I use 235/40R19 instead of 245/40R19?
Yes, using a 235/40R19 tire instead of a 245/40R19 is generally accepted. The overall diameter difference is 8.00 mm (0.315"), which is only a 1.18% decrease. This falls safely within the recommended ±3% tolerance and will not negatively impact your vehicle's mechanical systems.
Expect a slight increase in fuel efficiency with the 235 mm tire compared with the 245 tire, due to less rolling resistance. Keep in consideration that you lose 10 mm of tread width when using a 235/40R19 tire instead of a 245/40R19. This may result in a slight decrease in ultimate cornering grip and marginally longer braking distances on dry pavement compared to the wider 245 tire.
Recommended 235/40R19 Tires
If you plan to switch to 235/40R19 instead of 245/40R19, well-regarded options in this size include:
All You Need to Know About 245/40R19 Tires
245/40R19 tires have a section width of 245 millimeters (mm), an aspect ratio of 40%, radial construction, and a 19-inch wheel diameter. Before buying tires sized 245/40R19, converting 245/40R19 size in inches, comparing it with similar tire sizes like 245/45R18 and 235/40R19, and researching the best 245/40R19 tires helps drivers shop for the right set for their vehicles.
Recommended 245/40R19 Tires
Well-regarded options in 245/40R19 size include:
What Are The Dimensions of 245/40R19 Tires in Inches?
245/40R19 tires have a section width of 9.646" (≈ 9.6"), a sidewall height of 3.858" (≈ 3.9"), and a wheel diameter of 19 inches. The overall tire diameter is 26.717" (≈ 26.7"), the circumference is 83.942" (≈ 83.9"), and the recommended rim width range is 8.0 to 9.5 inches.
In inches, the 245/40R19 tire size can be represented as 26.7" × 9.6" R19.
245/40R19 tire size in millimeters and inches is presented in the below table:
245/40R19 Tire Size Dimensions | 245/40R19 Tire Size Dimensions in Inches (") | Formula to Convert 245/40R19 Size in Inches (") |
245 mm (section width) | 9.646" (≈ 9.6") | 245 ÷ 25.4 = 9.646 |
98.00 mm (sidewall height) | 3.858" (≈ 3.9") | (245 × 0.40) ÷ 25.4 = 3.858 |
19 (rim diameter) | 19" | Given |
678.60 mm (overall diameter) | 26.717" (≈ 26.7") | (2 × 98.00 ÷ 25.4) + 19 = 26.717 |
2131.90 mm (circumference) | 83.942" (≈ 83.9") | 26.717 × 3.1416 = 83.942 |
339.30 mm (radius) | 13.358" (≈ 13.4") | 26.717 ÷ 2 = 13.358 |
Comparison of 245/40R19 With Other Tire Sizes
Compare 245/40R19 with other tire sizes, such as 245/45R18 and 235/40R19, to learn the key differences between them and make the right choice when buying new tires.
What Is The Difference Between 245/40R19 vs 245/45R18?
The main difference between 245/40R19 and 245/45R18 is the wheel diameter and sidewall height. The 245/40R19 tire has a 12.25 mm (0.482") shorter sidewall than the 245/45R18, but it uses a 25.40 mm (1.0") larger rim diameter. This results in an overall diameter difference of only 0.90 mm (0.035"), making the 245/40R19 just 0.1% taller. Because the total height is nearly identical, these are excellent 'sister sizes' that will not affect your speedometer or safety systems when swapping between 18-inch and 19-inch wheels.
The tire dimensions or measurement difference between 245/40R19 vs 245/45R18 is shown in the below table.
Tire dimensions | 245/40R19 tires dimensions in millimetre (mm) and inches (") | 245/45R18 tires dimensions in millimetre (mm) and inches (") | Difference b/w 245/40R19 and 245/45R18 in millimetre (mm) and inches (") | Percentage ≈ difference b/w 245/40R19 and 245/45R18 |
Section Width | 245 mm (≈ 9.65") | 245 mm (≈ 9.65") | - | - |
Sidewall Height | 98.00 mm (≈ 3.86") | 110.25 mm (≈ 4.34") | 12.25 mm (≈ 0.48") | ≈ 12.5% |
Overall Diameter | 678.60 mm (≈ 26.72") | 677.70 mm (≈ 26.68") | 0.90 mm (≈ 0.04") | ≈ 0.1% |
Circumference | 2131.90 mm (≈ 83.94") | 2129.07 mm (≈ 83.82") | 2.83 mm (≈ 0.11") | ≈ 0.1% |
Radius | 339.30 mm (≈ 13.36") | 338.85 mm (≈ 13.34") | 0.45 mm (≈ 0.02") | ≈ 0.1% |
Rim Diameter | 482.6 mm (19.00") | 457.2 mm (18.00") | 25.4 mm (≈ 1.00") | ≈ 5.3% |
Rim width range | 8.0’’- 9.5’’ | 7.5’’- 9.0’’ | - | - |
Can I use 245/45R18 instead of 245/40R19?
No, you cannot use a 245/45R18 tire directly on a 19-inch wheel. The tire will not fit the rim; to use a 245/45R18 size, you need to purchase a separate set of 18-inch wheels.
Swapping the entire wheel and tire set from a 19" to an 18" setup is a very common and effective modification for three reasons: identical height (diameter difference is less than 0.1% ), improved comfort (245/45R18 has a 12.25 mm (0.5") taller sidewall, which smooths out the ride on rough roads due to the extra rubber), and cost/durability (18-inch wheels and tires are generally less expensive than 19-inch versions).
If you decide to get 18-inch wheels to use 245/45R18 tires, ensure the new wheels match your car's:
- Bolt Pattern (e.g., 5x114.3)
- Center Bore (the hole in the middle of the wheel)
- Offset (how far the wheel sits in or out)
- Brake Clearance (ensure the smaller 18" wheel fits over your brake calipers)
What Is The Difference Between 245/40R19 vs 235/40R19?
The main difference between 245/40R19 and 235/40R19 is the section width. The 245/40R19 tire is 10 mm (0.39") wider, resulting in a 4.0 mm (0.16") taller sidewall and an 8.0 mm (0.31") larger overall diameter. Both tires generally fit the same 8.0" to 9.5" rim width range, making them easy to swap on the same set of wheels.
The tire dimensions or measurement difference between 245/40R19 vs 235/40R19 is shown in the below table.
Tire dimensions | 245/40R19 tires dimensions in millimetre (mm) and inches (") | 235/40R19 tires dimensions in millimetre (mm) and inches (") | Difference b/w 245/40R19 and 235/40R19 in millimetre (mm) and inches (") | Percentage ≈ difference b/w 245/40R19 and 235/40R19 |
Section Width | 245 mm (≈ 9.65") | 235 mm (≈ 9.25") | 10 mm (≈ 0.39") | ≈ 4.1% |
Sidewall Height | 98.00 mm (≈ 3.86") | 94.00 mm (≈ 3.70") | 4.00 mm (≈ 0.16") | ≈ 4.1% |
Overall Diameter | 678.60 mm (≈ 26.72") | 670.60 mm (≈ 26.40") | 8.00 mm (≈ 0.31") | ≈ 1.2% |
Circumference | 2131.90 mm (≈ 83.94") | 2106.77 mm (≈ 82.94") | 25.13 mm (≈ 0.99") | ≈ 1.2% |
Radius | 339.30 mm (≈ 13.36") | 335.30 mm (≈ 13.20") | 4.00 mm (≈ 0.16") | ≈ 1.2% |
Rim Diameter | 482.6 mm (19.00") | 482.6 mm (19.00") | - | - |
Rim width range | 8.0’’- 9.5’’ | 8.0’’- 9.5’’ | - | - |
Can I use 235/40R19 instead of 245/40R19?
Yes, using a 235/40R19 tire instead of a 245/40R19 is generally accepted. The overall diameter difference is 8.00 mm (0.315"), which is only a 1.18% decrease. This falls safely within the recommended ±3% tolerance and will not negatively impact your vehicle's mechanical systems.
Expect a slight increase in fuel efficiency with the 235 mm tire compared with the 245 tire, due to less rolling resistance. Keep in consideration that you lose 10 mm of tread width when using a 235/40R19 tire instead of a 245/40R19. This may result in a slight decrease in ultimate cornering grip and marginally longer braking distances on dry pavement compared to the wider 245 tire.
Recommended 235/40R19 Tires
If you plan to switch to 235/40R19 instead of 245/40R19, well-regarded options in this size include:
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