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235/55R18 Tire Size
All You Need to Know About 235/55R18 Tires
235/55R18 tires have a section width of 235 millimeters (mm), an aspect ratio of 55%, radial construction, and an 18-inch wheel diameter. Before buying tires sized 235/55R18, converting the 235/55R18 tire size into inches, comparing 235/55R18 tires with similar tire sizes like 235/50R18 and 225/55R18, and researching the best 235/55R18 tires helps drivers shop for the correct tires for their vehicles.
What Are the Dimensions of a 235/55R18 Tire in Inches?
A 235/55R18 tire has a section width of 9.25 inches, a sidewall height of 5.09 inches, and a rim diameter of 18 inches. The overall tire diameter of a 235/55R18 tire is 28.18 inches, circumference of 88.52 inches, and recommended rim width range of 6.5 inches to 8.5 inches. The 235/55R18 tire size is represented as 28.2" × 9.3" R18.
How tall and wide are 235/55R18 tires? A 235/55R15 tire is approximately 28.18 inches (639 mm) tall and about 9.25 inches (235 mm) wide.
Most Recommended 235/55R18 Tires
Drivers selecting 235/55R18 tires often want a confident, easy-going ride that remains predictable in daily traffic while adapting well to changing road and weather conditions. Top 5 Tire Recommendations for 235/55R18 (by conditions) include:
Comparison of 235/55R18 With Similar Tire Sizes
Comparing 235/50R18 with 235/55R18 and 225/50R18 shows the key differences between these tire sizes and helps buyers choose the right tires to purchase.
What Is the Difference Between 235/55R18 vs 235/50R18 Tire Sizes?
The main difference between 235/55R18 and 235/50R18 is the sidewall height, which results from a five percentage-point difference in aspect ratio. The 235/55R18 tire has a taller sidewall (55% of 235 mm → 129.25 mm) compared to the 235/50R18 (50% of 235 mm → 117.5 mm). That makes the 235/55R18 sidewall approximately 11.75 mm (≈ 0.46") taller, resulting in an overall diameter that is about 23.5 mm (≈ 0.93") larger than the 235/50R18.
The tire dimensions or measurement differences between 235/55R18 and 235/50R18 are provided in the table below:
Tire Dimensions | 235/55R18 tires dimensions in millimeters (mm) and inches (") | 235/50R18 tires dimensions in millimeters (mm) and inches (") | Difference b/w 235/55R18 and 235/50R18 in mm and inches (") | Percentage ≈ difference b/w 235/55R18 and 235/50R18 |
Section Width | 235 mm (≈ 9.25") | 235 mm (≈ 9.25") | 0 mm | 0 % |
Sidewall Height | 129 mm (≈ 5.09") | 118mm (≈ 4.63") | 11.8 mm (≈ 0.46") | ≈ 9.1% |
Overall Diameter | 716 mm (≈ 28.18") | 692 mm (≈ 27.25") | 23.5 mm (≈ 0.93") | ≈ 3.3% |
Circumference | 2248 mm (≈ 88.52") | 2175 mm (≈ 85.61") | 73mm (≈ 2.91") | ≈ 3.3% |
Radius | 358 mm (≈ 14.09") | 346 mm (≈ 13.63") | 11.8 mm (≈ 0.46") | ≈ 3.3% |
Rim Diameter | 457.2 mm (18.00") | 457.2 mm (18.00") | - | - |
Rim Width Range | 6.5"–8.5" | 6.5"–8.5" | - | - |
Can I use 235/50R18 instead of 235/55R18?
Yes, you can switch to 235/50R18 from 235/55R18 sizes if you ensure the ≈0.93" change in overall diameter and ≈11 mm shorter sidewall won’t cause rubbing on the vehicle, and you accept the minor changes (≈3.4%) in speedometer reading and firmer handling.
What Is the Difference Between 235/55R18 vs 225/55R18?
The key difference between 235/55R18 and 225/55R18 sizes is the tread (section) width. The 235/55R18 has a 10 mm (≈ 0.39") wider footprint compared to 225/55R18, potentially providing better grip due to a wider contact patch on the road surface.
The tire dimensions or measurement difference between 235/55R18 vs 225/55R18 is provided in the table below.
Tire Dimensions | 235/55R18 tires dimensions in millimeters (mm) and inches (") | 225/55R18 tires dimensions in millimeters (mm) and inches (") | Difference b/w 235/55R18 and 225/55R18 in mm and inches (") | Percentage ≈ difference b/w 225/55R1 and 225/55R18 |
Section Width | 235 mm (≈ 9.25") | 225 mm (8.86") | 10 mm (≈ 0.39") | ≈ 4.44% |
Sidewall Height | 129.25 mm (≈ 5.09") | 123.75 mm (4.87") | 5.5 mm (≈ 0.22") | ≈ 4.44% |
Overall Diameter | 715.7 mm (≈ 28.18") | 704.5 mm (27.74") | 11.0 mm (≈ 0.43") | ≈ 1.56% |
Circumference | 2248.4 mm (≈ 88.52") | 2213 mm (87.13") | 34.6 mm (≈ 1.36") | ≈ 1.56% |
Radius | 357.85 mm (≈ 14.09") | 352.25 mm (13.87") | 5.5 mm (≈ 0.22") | ≈ 1.56% |
Rim Diameter | 457.2 mm (18.00") | 457.2 mm (18") | - | - |
Rim Width Range | 6.5" – 8.5" | 6.0" - 8.0" | - | - |
Can I use 225/55R18 instead of 235/55R18?
Yes, you can generally switch from 235/55R18 to 225/55R18. Still, you should know the effects: the narrower 225/55R18 will slightly reduce the contact patch, reducing some lateral grip in some conditions, and will offer a small amount of extra clearance; expect a negligible fuel economy benefit, and a minor 1.6% impact on speedometer reading change due to the 1.56% diameter difference.
All You Need to Know About 235/55R18 Tires
235/55R18 tires have a section width of 235 millimeters (mm), an aspect ratio of 55%, radial construction, and an 18-inch wheel diameter. Before buying tires sized 235/55R18, converting the 235/55R18 tire size into inches, comparing 235/55R18 tires with similar tire sizes like 235/50R18 and 225/55R18, and researching the best 235/55R18 tires helps drivers shop for the correct tires for their vehicles.
What Are the Dimensions of a 235/55R18 Tire in Inches?
A 235/55R18 tire has a section width of 9.25 inches, a sidewall height of 5.09 inches, and a rim diameter of 18 inches. The overall tire diameter of a 235/55R18 tire is 28.18 inches, circumference of 88.52 inches, and recommended rim width range of 6.5 inches to 8.5 inches. The 235/55R18 tire size is represented as 28.2" × 9.3" R18.
How tall and wide are 235/55R18 tires? A 235/55R15 tire is approximately 28.18 inches (639 mm) tall and about 9.25 inches (235 mm) wide.
Most Recommended 235/55R18 Tires
Drivers selecting 235/55R18 tires often want a confident, easy-going ride that remains predictable in daily traffic while adapting well to changing road and weather conditions. Top 5 Tire Recommendations for 235/55R18 (by conditions) include:
Comparison of 235/55R18 With Similar Tire Sizes
Comparing 235/50R18 with 235/55R18 and 225/50R18 shows the key differences between these tire sizes and helps buyers choose the right tires to purchase.
What Is the Difference Between 235/55R18 vs 235/50R18 Tire Sizes?
The main difference between 235/55R18 and 235/50R18 is the sidewall height, which results from a five percentage-point difference in aspect ratio. The 235/55R18 tire has a taller sidewall (55% of 235 mm → 129.25 mm) compared to the 235/50R18 (50% of 235 mm → 117.5 mm). That makes the 235/55R18 sidewall approximately 11.75 mm (≈ 0.46") taller, resulting in an overall diameter that is about 23.5 mm (≈ 0.93") larger than the 235/50R18.
The tire dimensions or measurement differences between 235/55R18 and 235/50R18 are provided in the table below:
Tire Dimensions | 235/55R18 tires dimensions in millimeters (mm) and inches (") | 235/50R18 tires dimensions in millimeters (mm) and inches (") | Difference b/w 235/55R18 and 235/50R18 in mm and inches (") | Percentage ≈ difference b/w 235/55R18 and 235/50R18 |
Section Width | 235 mm (≈ 9.25") | 235 mm (≈ 9.25") | 0 mm | 0 % |
Sidewall Height | 129 mm (≈ 5.09") | 118mm (≈ 4.63") | 11.8 mm (≈ 0.46") | ≈ 9.1% |
Overall Diameter | 716 mm (≈ 28.18") | 692 mm (≈ 27.25") | 23.5 mm (≈ 0.93") | ≈ 3.3% |
Circumference | 2248 mm (≈ 88.52") | 2175 mm (≈ 85.61") | 73mm (≈ 2.91") | ≈ 3.3% |
Radius | 358 mm (≈ 14.09") | 346 mm (≈ 13.63") | 11.8 mm (≈ 0.46") | ≈ 3.3% |
Rim Diameter | 457.2 mm (18.00") | 457.2 mm (18.00") | - | - |
Rim Width Range | 6.5"–8.5" | 6.5"–8.5" | - | - |
Can I use 235/50R18 instead of 235/55R18?
Yes, you can switch to 235/50R18 from 235/55R18 sizes if you ensure the ≈0.93" change in overall diameter and ≈11 mm shorter sidewall won’t cause rubbing on the vehicle, and you accept the minor changes (≈3.4%) in speedometer reading and firmer handling.
What Is the Difference Between 235/55R18 vs 225/55R18?
The key difference between 235/55R18 and 225/55R18 sizes is the tread (section) width. The 235/55R18 has a 10 mm (≈ 0.39") wider footprint compared to 225/55R18, potentially providing better grip due to a wider contact patch on the road surface.
The tire dimensions or measurement difference between 235/55R18 vs 225/55R18 is provided in the table below.
Tire Dimensions | 235/55R18 tires dimensions in millimeters (mm) and inches (") | 225/55R18 tires dimensions in millimeters (mm) and inches (") | Difference b/w 235/55R18 and 225/55R18 in mm and inches (") | Percentage ≈ difference b/w 225/55R1 and 225/55R18 |
Section Width | 235 mm (≈ 9.25") | 225 mm (8.86") | 10 mm (≈ 0.39") | ≈ 4.44% |
Sidewall Height | 129.25 mm (≈ 5.09") | 123.75 mm (4.87") | 5.5 mm (≈ 0.22") | ≈ 4.44% |
Overall Diameter | 715.7 mm (≈ 28.18") | 704.5 mm (27.74") | 11.0 mm (≈ 0.43") | ≈ 1.56% |
Circumference | 2248.4 mm (≈ 88.52") | 2213 mm (87.13") | 34.6 mm (≈ 1.36") | ≈ 1.56% |
Radius | 357.85 mm (≈ 14.09") | 352.25 mm (13.87") | 5.5 mm (≈ 0.22") | ≈ 1.56% |
Rim Diameter | 457.2 mm (18.00") | 457.2 mm (18") | - | - |
Rim Width Range | 6.5" – 8.5" | 6.0" - 8.0" | - | - |
Can I use 225/55R18 instead of 235/55R18?
Yes, you can generally switch from 235/55R18 to 225/55R18. Still, you should know the effects: the narrower 225/55R18 will slightly reduce the contact patch, reducing some lateral grip in some conditions, and will offer a small amount of extra clearance; expect a negligible fuel economy benefit, and a minor 1.6% impact on speedometer reading change due to the 1.56% diameter difference.
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