Tire Size 285/55r20 vs 33×12.50r20
Switching your vehicle’s tires can be a straightforward process, but it’s essential to ensure that the new tires fit your vehicle properly. In this article, we’ll explore the key differences between the 285/55r20 and 33×12.50r20 tire sizes and the potential impacts of making the switch.
- Increased ground clearance for improved off-road performance
- Potential reduction in gas mileage due to larger rolling resistance
- Wider tire width of 12.52 inches may impact vehicle’s appearance and handling
- 2.1% increase in overall diameter exceeds the recommended 3% range
- Speedometer reading will be 2.1% higher than actual speed
- Larger tire circumference of 103.74 inches compared to 101.61 inches
- 5.5% increase in sidewall height for potentially better ride comfort
Fitment Guide
According to the guidelines, replacement tires should have an overall diameter within a 3% range of the original tire’s diameter.
The 0.68-inch (17.22 mm) difference between the two tire sizes exceeds this acceptable range, meaning the interchange is not recommended without making adaptations to prevent issues such as rubbing or clearance problems.
On-Road Impact
The larger diameter of the 33×12.50r20 tires can have a noticeable impact on the on-road performance of your vehicle.
The increased circumference of the new tires will result in a reduction in speedometer accuracy, with the speedometer reading approximately 2.1% higher than the actual speed.
This means that at a displayed speed of 20 mph, your actual speed would be around 19.58 mph. While this may not seem like a significant difference, it’s important to be aware of the change in order to avoid inadvertently speeding.
Off-Road Impact
The switch to the larger 33×12.50r20 tires can also affect the off-road capabilities of your vehicle.
The increased ground clearance provided by the taller tires can be beneficial for navigating rough terrain, but it may also result in a slight decrease in gas mileage due to the larger rolling resistance.
Additionally, the wider tire width of 12.52 inches (318 mm) compared to the 11.22 inches (285 mm) of the original tires may impact the vehicle’s aesthetics and handling, particularly on paved roads.
What is the Difference Between 285/55r20 and 33×12.50r20?
The 33×12.50r20 tire is larger than the 285/55r20 in several aspects. It has a 0.68 inch larger diameter, 1.3 inches more width, and 2.13 inches greater circumference.
The sidewall is also 0.34 inches taller. These differences affect the tire’s overall size, performance, and fitment on a vehicle.
Can I Use 33×12.50r20 Instead of 285/55r20?
Using a 33×12.50r20 instead of a 285/55r20 is not generally recommended. While the 2.1% diameter difference is within the typical 3% guideline, the 11.6% width difference is significant.
This substantial change in width could negatively impact vehicle handling, fitment, and overall performance. It’s crucial to consult a tire professional before making such a switch.
How Much Taller Is a 33×12.50r20 Tire Than a 285/55r20?
A 33×12.50r20 tire stands 0.68 inches (or 17.22 millimeters) taller than a 285/55r20 tire. This height difference, while seemingly small, can affect various aspects of your vehicle’s performance, including ground clearance, speedometer accuracy, and overall appearance.
It’s important to consider these factors when contemplating a tire size change.
285/55r20 vs 33×12.50r20 Table
This table provides a clear comparison of the two tire sizes, detailing their differences in several critical areas.
This table compares the tire sizes 285/55R20 and 33×12.50R20, highlighting their differences in key metrics such as diameter, width, circumference, sidewall height, and revolutions per mile.
| Feature | 285/55R20 | 33×12.50R20 | Difference |
|---|---|---|---|
| Diameter inches (mm) | 32.34 (821.5) | 33.02 (838.72) | 0.68 (17.22) +2.1% |
| Width inches (mm) | 11.22 (285) | 12.52 (318) | 1.3 (33) +11.6% |
| Circumference inches (mm) | 101.61 (2580.82) | 103.74 (2634.92) | 2.13 (54.1) +2.1% |
| Sidewall Height inches (mm) | 6.17 (156.75) | 6.51 (165.36) | 0.34 (8.61) +5.5% |
| Revolutions per mile (km) | 623.58 (387.47) | 610.78 (379.52) | -12.8 (-7.96) -2.1% |
| Speedo Reading | 20 mph | 20.42 mph | +0.42 mph |
How Much Wider is a 33×12.50r20 Tire Than a 285/55r20?
The 33×12.50r20 tire is 1.3 inches (or 33 millimeters) wider than the 285/55r20 tire. This significant width increase can impact your vehicle’s handling, steering response, and fitment within the wheel well.
It may also affect fuel efficiency due to increased rolling resistance. Consider these factors carefully before opting for the wider tire.
Our Observation
While the 2.1% difference in overall diameter exceeds the recommended 3% range, the impact on both on-road and off-road performance may not be dramatic.
The reduction in speedometer accuracy is relatively minor and can be easily accounted for. The increase in ground clearance may be beneficial for off-road use, but the associated decrease in gas mileage should be considered.
The wider tire width could potentially affect the vehicle’s appearance and handling, but the significance of these changes will depend on the specific vehicle and the owner’s preferences.
Ultimately, the decision to switch from 285/55r20 to 33×12.50r20 tires should be based on a careful evaluation of the potential benefits and drawbacks, as well as the owner’s specific needs and driving conditions.
Sabrina Khan Tisha, a lead writer at Tiresizecompare.com, brings a wealth of experience to her role. As the CEO of amarcalculator.com, she oversees a platform offering diverse calculation tools. Sabrina’s background in HR and office management, coupled with her numerous certifications, informs her approach to content creation. Her leadership and expertise contribute significantly to the automotive and calculation sectors.
