Tire Size 285/55r20 vs 33×12.50r20
The main difference between 285/55R20 and 33×12.50R20 tires is their section width. The 285/55R20 tires have a width of 11.22 inches, while 33×12.50R20 tires are wider at 12.52 inches, a difference of 1.3 inches or 11.6%. This width difference impacts various performance factors.
| / | R |
| / | R |
| Parameter | 235/35 R18 | 205/40 R18 | Differ. |
|---|---|---|---|
| Tire Height | |||
| Section Width | |||
| Circumference | |||
| Sidewall Height | |||
| Revolutions | |||
| Rim Size |
Fitment Guide
For optimal performance and safety, tire replacement should adhere to the vehicle manufacturer’s specifications, ideally not deviating more than 3% from the original tire’s diameter.
The 285/55r20 and 33×12.50r20 have a diameter difference of about 2.1%, which is within the acceptable range, ensuring minimal issues with speedometer accuracy and vehicle handling.
Gas Mileage
The 285/55r20 tires, being narrower, typically offer better gas mileage due to their lower rolling resistance.
In contrast, the 33×12.50r20’s larger width and diameter increase rolling resistance and weight, potentially reducing fuel efficiency. This is an essential consideration for those prioritizing fuel economy in their vehicle’s operation.
Ground Clearance
Choosing the 33×12.50r20 tires provides increased ground clearance, beneficial for off-road driving or navigating rough terrain. However, it’s essential to note that higher ground clearance can affect vehicle handling and aerodynamics.
Conversely, the 285/55r20 tires, being smaller, offer less clearance but maintain closer to the vehicle’s original driving characteristics.
Ride Comfort
The 33×12.50r20 tires, with their larger sidewall height, generally offer better impact absorption off-road, contributing to a more comfortable ride in rough conditions.
The 285/55r20 tires, however, might provide a smoother experience on highways and urban roads due to their smaller size and reduced sidewall flex.
Speedometer Difference
Using the 33×12.50r20 tires will result in a slight underestimation of speed by the speedometer due to the larger diameter.
For every 20 mph, the speedometer will read approximately 20.42 mph, a minor difference but one that can accumulate over long distances.
Aesthetic Look
The choice between 285/55r20 and 33×12.50r20 can also affect the vehicle’s aesthetics. The broader and taller 33×12.50r20 tires might offer a more rugged, aggressive look preferred by many off-road enthusiasts.
The 285/55r20 tires, being narrower and slightly smaller, maintain a more traditional appearance, which may be preferable for those valuing a stock look.
Handling & Stability
The narrower 285/55r20 tires often provide enhanced handling and responsiveness on paved roads, beneficial for everyday driving.
The 33×12.50r20 tires, while offering improved stability in off-road conditions, might not deliver the same level of responsiveness due to their size and weight.
Noise & Vibration
Larger tires like the 33×12.50r20 can produce more road noise, especially with aggressive tread patterns. However, they also have the potential to absorb more road vibrations due to their increased air volume.
The 285/55r20 tires may offer a quieter ride on smooth surfaces but might not absorb road irregularities as effectively.
Durability & Wear
Durability and wear can vary between tire sizes and designs. While larger tires may absorb impacts better, they can also put more strain on vehicle components.
Proper maintenance and alignment are crucial for maximizing the lifespan of either tire size.
Is a 285/55r20 a 33 Inch Tire?
To determine if this tire size is equivalent to a 33-inch tire, we need to calculate its overall diameter. The 285/55R20 tire has an overall diameter of approximately 32.34 inches. Therefore, it is not exactly a 33-inch tire but is very close to this size.
Our Observation
The 285/55R20 is best suited for on-road driving with its responsive handling, quiet ride, and fuel efficiency. The 33×12.50R20 is preferable for off-road use thanks to its added ground clearance, cushioned ride, and improved traction.
While differences are modest, the 33×12.50R20’s taller sidewall aesthetic may be favored for trucks and SUVs.
Overall, we recommend the more well-rounded 285/55R20 tire for most drivers who stay on paved roads. But for regular off-road use, the 33×12.50R20 is a better choice to handle rough terrain.
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.
