Tire Size 275 65r18 vs 33×12 50r18
Selecting the right tire size for your vehicle, it can be a daunting task, especially if you don’t have any prior knowledge of tire sizing. Two tire sizes that are commonly compared are the 275/65R18 and the 33×12.50R18. Both tire sizes have their own unique features and characteristics that can influence factors such as handling, traction, fuel efficiency, and speedometer accuracy.
275/65r18 vs 33×12 50r18 Table
This comparison table will help you to understand the difference between those tire size at a glance.
| Feature | 33/12.5-18 | 275/65-18 | Difference |
|---|---|---|---|
| Diameter | 33.02 | 32.07 | -0.95 (-2.9%) |
| Width | 12.52 | 10.83 | -1.69 (-13.5%) |
| Circum. | 103.75 | 100.77 | -2.98 (-2.9%) |
| Sidewall Height | 7.51 | 7.04 | -0.47 (-6.3%) |
| Revolutions | 610.72 (379.48) | 628.78 (390.71) | 18.07 (3%) |
Alternative Tire Size For 275/65R18
The overall diameter of replacement tires should not deviate more than 3% from that of the original tire.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 225/75R18 | 31.3″ (795 mm) | -2.5% |
| 285/60R18 | 31.5″ (799 mm) | -2% |
| 265/65R18 | 31.5″ (801 mm) | -1.7% |
| 245/70R18 | 31.5″ (801 mm) | -1.7% |
| 235/75R18 | 31.9″ (809 mm) | -0.7% |
| 255/70R18 | 32.1″ (815 mm) | 0% |
| 305/60R18 | 32.4″ (823 mm) | 1% |
| 285/65R18 | 32.6″ (827 mm) | 1.5% |
| 265/70R18 | 32.6″ (829 mm) | 1.7% |
| 375/50R18 | 32.8″ (833 mm) | 2.2% |
Tire Size Alternative 33×12.50R18
When replacing tires, it’s important to choose ones that have an overall diameter no more than 3% different from that of the original tires.
| Tire Size | Diameter | Diameter Difference |
|---|---|---|
| 255/70r18 | 32.1″ | -2.73% |
| 265/70r18 | 32.6″ | -1.21% |
| 275/65r18 | 32.1″ | -2.73% |
| 285/65r18 | 32.6″ | -1.21% |
| 305/60r18 | 32.4″ | -1.82% |
| 275/70r18 | 33.2″ | 0.61% |
| 285/70r18 | 33.7″ | 2.12% |
| 295/65r18 | 33.1″ | 0.3% |
| 305/65r18 | 33.6″ | 1.82% |
| 325/60r18 | 33.4″ | 1.21% |
| 267/71r18 | 33.0″ | 0% |
| 330/58r18 | 33.0″ | 0% |
| 343/56r18 | 33.0″ | 0% |
Overall Diameter
The overall diameter of a tire is the distance from one end of the tire to the other when mounted on a wheel. The 275/65r18 tire has an overall diameter of 32.07 inches, while the 33×12.50r18 tire has an overall diameter of 33.02 inches. This means the 33×12.50r18 tire is approximately 0.95 inches larger than the 275/65r18 tire.
Aspect Ratio
The aspect ratio of a tire is the height of the tire’s sidewall expressed as a percentage of the tire’s width. The 275/65r18 tire has an aspect ratio of 65, while the 33×12.50r18 tire has an aspect ratio of 50. This means the 275/65r18 tire has a taller sidewall than the 33×12.50r18 tire.
Tread Width
The tread width of a tire is the width of the portion of the tire that comes into contact with the road. The 275/65r18 tire has a tread width of 10.83 inches, while the 33×12.50r18 tire has a tread width of 12.52 inches. This means the 33×12.50r18 tire has a wider tread than the 275/65r18 tire.
Rim Diameter
The rim diameter is the diameter of the wheel that the tire is designed to fit. Both the 275/65r18 and the 33×12.50r18 tires are designed to fit on an 18-inch rim.
Sidewall Height
The sidewall height is the distance from the rim to the outer edge of the tire’s tread. The 275/65r18 tire has a sidewall height of 7.04 inches, while the 33×12.50r18 tire has a sidewall height of 7.51 inches. This means the 33×12.50r18 tire has a taller sidewall than the 275/65r18 tire.
Circumference
The circumference of a tire is the distance around the tire. The 275/65r18 tire has a circumference of 100.77 inches, while the 33×12.50r18 tire has a circumference of 103.75 inches. This means that the 33×12.50r18 tire travels further with each revolution than the 275/65r18 tire.
Revolutions
The number of revolutions a tire makes per mile can affect the accuracy of your vehicle’s speedometer. The 275/65r18 tire makes 628.78 revolutions per mile, while the 33×12.50r18 tire makes 610.72 revolutions per mile.
Our Observation
In our observation, the 33×12.50r18 tire is better suited for off-road and rough terrain due to its larger tread width, which provides better traction and stability on uneven surfaces. Additionally, the wider tread of the 33×12.50r18 tire offers a larger surface area in contact with the road, improving handling and braking on wet and dry surfaces.
On the other hand, the 275/65r18 tire is better suited for on-road driving due to its taller sidewall, which provides a smoother and more comfortable ride. The taller sidewall also helps to absorb impacts and reduce road noise, resulting in a quieter ride.
In the end, your choice of tire size should be based on your personal preferences and driving needs. We hope this informative comparison has provided you with the necessary information to make an informed decision.
Meet Caitlin McCormack, a Tire Size Expert and Blogger Passionate About Everything Related to Tires. With Years of Experience in the Tire Industry, Caitlin Has Become an Expert in Tire Sizes and Their Impact on Vehicle Performance.
