Tire Size 285/55r20 vs 285/60r20
The main difference between 285/55r20 and 285/60r20 tires is the sidewall height. The 285/55r20 tire has a sidewall height of 156.75mm, while the 285/60r20 tire has a sidewall height of 171mm.
This 0.56 inch (14.25mm) difference equates that the 285/60r20 tire has a taller sidewall, which can provide a more comfortable ride and better handling off-road.
| / | R |
| / | R |
| Parameter | 235/35 R18 | 205/40 R18 | Differ. |
|---|---|---|---|
| Tire Height | |||
| Section Width | |||
| Circumference | |||
| Sidewall Height | |||
| Revolutions | |||
| Rim Size |
Fitment Guide
The overall diameter of the 285/60r20 is 3.5% larger than the 285/55r20. Replacement tires should be within 3% of the original size to prevent clearance issues.
The 285/60r20 slightly exceeds this threshold, so small adaptations like a leveling kit may be required in order to avoid rubbing at full turn.
Ground Clearance
With a diameter of 33.46 inches, the 285/60r20 tire size provides 1.12 inches (28.5mm) more ground clearance than the 285/55r20 at 32.34 inches.
This added clearance is useful for off-road driving, helping avoid scrapes over rough terrain. However, the larger 285/60r20 diameter causes a lower speedometer reading than the 285/55r20.
Gas Mileage
The 285/55r20, with its smaller diameter and contact patch, will likely provide slightly better fuel efficiency than the 285/60r20.
The larger tire has more rolling resistance and rotational mass, detracting somewhat from gas mileage.
Ride Comfort
The taller 70 aspect ratio sidewall of the 285/60r20 absorbs road impacts better than the 55 aspect 285/55r20.
This provides a smoother ride, especially over uneven terrain. The 285/55r20 transmits more road harshness into the cabin due to its shorter, stiffer sidewall construction.
Aesthetics
The 285/60r20 has a subtly “stretched” look owing to its marginally taller sidewall versus the slightly lower-profile appearance of the 285/55r20.
Subjectively, the taller 60 aspect suits trucks and SUVs well, providing a more aggressive aesthetic.
Handling & Stability
The shorter sidewall of the 285/55r20 offers sharper, more responsive handling than the 285/60r20.
The taller sidewall of the 285/60r20 exhibits more flex, reducing handling precision somewhat. However, both provide stable overall handling.
Noise & Vibration
With its shorter, stiffer sidewall, the 285/55r20 transmits more road noise and vibration into the cabin compared to the 285/60r20.
The extra sidewall flex of the 285/60r20 dampens noise and vibration more effectively.
Durability & Wear
The 285/55r20, with its shorter sidewall, will likely exhibit slightly more even tire wear and marginally longer tread life compared to the 285/60r20.
The larger 285/60r20 puts more stress on the tire and vehicle components.
Adverse Conditions
Both tires perform similarly in rain, snow, and off-road conditions. The extra ground clearance of the 285/60r20 provides a slight advantage, while the 285/55r20’s shorter sidewall gives it a bit more responsiveness.
Speedometer
At an actual speed of 20mph, the speedometer reads 20.69mph with the 285/60r20 tires versus 20mph with the 285/55r20s. This 0.69mph difference is due to the larger overall diameter of the 285/60r20.
How Tall Is A 285/60r20 In Tire?
The height of a 285/60r20 tire is 33.46 inches. This is calculated by multiplying the tire’s width (285mm) and multiplying it by the aspect ratio (60%).
This gives us the sidewall height of 171mm. Then, we add the sidewall height to the diameter of the wheel (20 inches) to get the overall tire height of 33.46 inches.
How Tall Is A 285/55r20 Tire?
The height of a 285/55R20 tire is 32.34 inches. This is calculated by multiplying the tire’s width (285mm) and multiplying it by the aspect ratio (55%).
This gives us the sidewall height of 156.75mm. Then, we add the sidewall height to the diameter of the wheel (20 inches) to get the overall tire height of 32.34 inches.
285/60r20 vs 285/55r20
Take a quick look at this comparison table to easily comprehend the differences.
Our Observation
Based on the differences outlined, both the 285/55R20 and 285/60R20 have merits depending on usage. The 285/60R20 is better suited for off-roading, with its extra ground clearance and cushioned ride.
The 285/55R20 is the superior choice for responsive handling and maximizing tread life. Overall, we recommend the more well-rounded 285/60R20 for most drivers and vehicles.
The moderate increase in sidewall height provides a better balance of on-road comfort and off-road clearance without compromising handling. For performance driving, the lower-profile 285/55R20 is ideal.
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.
