Tire Size 275/55r20 vs 285/55r20
The main difference between the tire sizes 275/55r20 and 285/55r20 is the section width. While both are 20-inch tire diameters, the 285/55r20 is wider by 0.39 inches (10mm) than the 275/55r20 tire size. This 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
The 275/55r20 and 285/55r20 have an overall diameter difference of only 1.4%. This is well within the 3% limit for direct replacement without adaptations.
So, either tire can directly substitute the other without lift kits or modifications needed.
Ground Clearance
With a diameter 0.43 inches (11mm) taller, the 285/55r20 provides slightly more ground clearance than the 275/55r20.
This added clearance is beneficial for off-road driving, helping prevent scrapes over rocks or rutted trails. However, the larger diameter also causes a lower speedometer reading.
Gas Mileage
The wider 285/55r20 has a larger contact patch and more rotational mass than the 275/55r20.
This results in marginally higher rolling resistance and inertia, decreasing fuel efficiency slightly. Expect 1-2 mpg less with the 285 width.
Ride Comfort
While the diameter is nearly identical, the 285/55r20’s 0.22 inch (5.5mm) taller sidewall provides a touch more cushioning from impacts like potholes and expansion joints.
This enhanced shock absorption contributes to a smoother, more comfortable ride, especially on uneven pavement.
Aesthetics
Visually, the difference between 275 and 285 widths is subtle on most vehicles. The 285 fills out the wheel well slightly more for a muscular stance.
Subjectively, the 285/55r20 has a balanced look, whereas the 275/55r20 appears narrower with its taller sidewall.
Handling & Stability
The 285/55r20’s wider tread face improves cornering grip and high-speed stability over the narrower 275/55r20.
But the difference is modest – both offer responsive handling and traction. Off-road, the 285 width also bites into loose surfaces better for added traction.
Noise & Vibration
Neither width generates significant noise or vibration issues. The 285/55r20 runs quieter at higher speeds thanks to its shorter sidewall and minimal flexing.
Lower-profile tires like these transmit fewer impacts into the cabin. Expect a smoother, quieter highway cruise with the 285 widths.
Durability & Wear
With around 3% more rubber on the road, the 285/55r20 wears slightly faster than the 275/55r20, all else being equal.
Tread life is reduced by the added friction and flexing from the wider footprint. However, both widths exhibit even wear and can achieve 50,000+ miles with proper maintenance.
Adverse Conditions
Performance in rain, snow, and off-road conditions is comparable between the two sizes. The marginally wider 285/55r20 provides a bit more traction and stability.
But the 275/55r20’s taller sidewall aids responsiveness on slick surfaces. Overall, both work well year-round.
Speedometer Difference
At 20 mph actual speed, the 275/55R20 reads 20.27 mph while the 285/55R20 reads 20 mph. The 0.27 mph difference is due to the slightly larger diameter of the 275/55R20.
What Does 275 55r20 Tire Mean?
The first number, 275, is the tire’s width in millimeters. The second number, 55, is the aspect ratio. This is the height of the sidewall expressed as a percentage of the width. In this case, it’s 55%.
The last number, 20, is the diameter of the wheel in inches. This means it will provide a smoother ride and more grip on the road. It’s a good choice for people who want a balance between comfort and performance.
Our Observation
In summary, the 285/55R20’s wider tread provides more traction, stability, and cushioning than the 275/55R20, benefiting off-road driving.
But the 275/55R20 offers enhanced efficiency, handling, and treadlife, better suiting on-road performance. Choose the 275/55R20 for responsive daily driving and longevity. Opt for the 285/55R20 if off-road capabilities are a priority.
Evaluate your preferences and needs to select the best tire for your driving. Proper maintenance and inflation will help maximize the capabilities of both tire sizes.
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.
