Tire Size 275/55r20 vs 285/65r20
The sidewall height is the key difference between 275/55r20 and 285/65r20 tires. The 285/65r20 tire size has a sidewall height 1.34 inches (34 mm) taller than the 275/55r20, making up 22.5% of the total sidewall height.
| / | R |
| / | R |
| Parameter | 235/35 R18 | 205/40 R18 | Differ. |
|---|---|---|---|
| Tire Height | |||
| Section Width | |||
| Circumference | |||
| Sidewall Height | |||
| Revolutions | |||
| Rim Size |
Fitment Guide
The overall diameters differ by 2.68 inches or 8.4%. Replacement tires should typically be within 3% of the original size to prevent clearance issues.
The 285/65r20 exceeds this threshold, potentially requiring adaptations like a lift kit to fit correctly. The 275/55r20, being closer in size, is less likely to pose fitment problems.
Gas Mileage
The 275/55r20 has a more minor contact patch and diameter and provides slightly better fuel efficiency over the heavier, larger 285/65r20. The 275/55r20 is the better pick for daily drivers focused on the economy.
Ground Clearance
The taller 285/65R20 offers 1.34 inches more ground clearance than the 275/55R20, an advantage for off-roading.
But it causes a lower speedometer reading. The 275/55R20 reduces clearance, increasing risks of scrapes and damage.
Ride Comfort
The 285/65R20 extra sidewall cushioning smooths out imperfections, but the 275/55R20 transmits fewer vibrations on the road. For a supple ride on variable terrain, the 285/65R20 performs best.
Aesthetics
The 285/65R20 appears slightly “stretched” versus the 275/55R20. Its taller sidewall suits trucks aesthetically. For a low-profile look, the 275/55R20 fits the bill.
Handling & Stability
The 275/55R20’s shorter sidewall enables sharper handling and quicker response on pavement. The flexible 285/65R20 prioritizes stability and traction off-road over responsiveness.
Noise & Vibration
The stiff sidewall of the 275/55R20 increases road noise and vibration transmission. The shock-absorbing 285/65R20 runs quieter and smoother.
Durability & Wear
The 275/55R20 resists irregular wear well, while the heavier 285/65R20 applies more stress to components. For longevity, the 275/55R20 is the wiser choice.
Adverse Conditions
The 275/55R20 narrower tread may grip better in snow and ice. The wider 285/65R20 provides an edge in deep mud or rough terrain. Both perform well overall.
Speedometer Difference
At 20 mph actual speed, the speedometer reads 21.68 mph with 285/65R20 tires and 20 mph with 275/55R20. The size difference accounts for a 1.68 mph speedometer variance.
Difference Between 275/55r20 And 285/65r20?
The difference between the 275/55R20 and 285/65R20 tires is their section width. This means that the 285/65R20 tire is 10 millimeters wider than the 275/55R20 tire.
Can I Use 275/55r20 Instead of 285/65r20?
No, it is not recommended to substitute 275/55R20 tires in place of 285/65R20 tires on your vehicle. The overall diameter of the 275/55R20 tire is 8.4% smaller than the original 285/65R20 tire.
This exceeds the recommended diameter difference limit of 3% between replacement and OEM tires. Beyond this, the 3% threshold risks clearance issues, speedometer inaccuracies, and other problems.
How Much Taller Is A 275/55r20 Tire Than A 285/65r20?
The 285/65r20 tire is 2.68 inches (68mm) taller than to the 275/55r20 tire size. This equals a 8.4% increase in overall height.
The 275/55r20 tire has an overall height of approximately 31.91 inches (810.5mm), while the 285/65r20 tire has an overall height of around 34.59 inches (878.5mm).
How Much Wider Is A 285/65r20 Tire Than A 275/55r20?
The tire size 285/65r20 is wider than the 275/55R20 tire size by 0.39 inches (10mm). This means that the section width increases by approximately 3.6% when switching from the 275/55r20 to the wider 285/65r20 tire.
To put it simply, the 275/55R20 tire measures 10.83 inches in width, while the 285/65r20 tire has a width of 11.22 inches.
What Does 285/65r20 Mean?
The tire size “285/65R20” indicates that the tire is 285 millimeters wide, and its sidewall height is 65% of its width. The letter “R” signifies that the tire has radial construction, which is a common type of tire construction.
The number “20” corresponds to the wheel diameter in inches the tire is designed to fit. Equivalently, the tire size 285/65R20 translates to 34.6×11.2R20 in inches.
What Does 275/55r20 Mean?
The tire size “275/55r20” specifies a 275 millimeters wide tire with a sidewall height equivalent to 55% of its width. The “R” indicates radial construction, a prevalent tire construction type known for durability and performance.
The “20” signifies the wheel diameter in inches the tire intends to fit. The tire size 275/55R20 can be expressed as 31.9×10.8R20 in inches.
275/55r20 vs 285/65r20
Our Observation
The 275/55R20 and 285/65R20 tires have minor differences, making each better suited for certain purposes. The 275/55R20 offers a smoother on-road ride, improved handling, lower rolling resistance, and long-term durability.
It excels as an economical daily driver tire. Meanwhile, the 285/65R20 provides extra ground clearance, cushioning, and traction for off-road adventures, although it is heavier and less fuel-efficient.
Most drivers will experience better performance, value, and versatility from the responsive 275/55R20 all-season tire. We recommend it as the best choice for the majority of users.
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.