Tire Size 275/55r20 vs 275/65r20

The main difference between 275/55r20 and 275/65r20 tires is the aspect ratio. The aspect ratio is the second number in the tire size designation, and it represents the height of the sidewall as a percentage of the tire’s width.

275/55r20 vs 275/65r20

This table of comparison will enable you to quickly understand the differences.

Fitment Guide

The overall diameter of 275/65r20 tires is 2.17 inches (55mm) larger than 275/55r20, a difference of 6.8%.

Replacement tires should be within 3% of the original size to prevent clearance issues or speedometer errors. The 275/65r20 may require adaptations like a lift kit to fit properly.

Ground Clearance

With a diameter of 34.07 inches, the 275/65r20 tire size provides 1.08 inches (27.5mm) more ground clearance than the 275/55r20 at 31.91 inches.

This added clearance aids off-road driving by preventing scrapes over obstacles. However, the larger diameter causes a lower speedometer reading.

Gas Mileage

The 275/55r20 smaller contact patch and lower rotational mass improve fuel efficiency, a big perk for daily drivers. The larger 275/65r20 may detract from mpg due to more rolling resistance and weight.

Ride Comfort

The extra sidewall height of the 275/65r20 absorbs road impacts better than the 275/55r20, providing a smoother ride over uneven terrain. The difference is modest but noticeable on very bumpy roads.

Aesthetics

Visually, the 275/65r20 will have a slightly taller sidewall, giving a subtly “stretched” look. Some vehicles suit this aesthetic over a low-profile appearance. The taller 70 aspect suits trucks and SUVs well.

Handling & Stability

The 275/55r20 shorter sidewall enhances handling precision and responsiveness on the pavement. The taller 275/65r20 sidewall flexes more, reducing handling sharpness slightly. Both deliver stable handling overall.

Noise & Vibration

The 275/55r20 transmits more road noise and vibration due to its stiffer sidewall. The 275/65r20 extra flex dampens noise and vibration somewhat. Differences are minor for a comfortable, quiet ride.

Durability & Wear

The 275/55r20 smaller size potentially exhibits more even wear and longer tread life. The larger 275/65r20 endures more impact, but its added weight causes more component wear.

Adverse Conditions

The 275/55r20 shorter sidewall makes it a bit more responsive in rain, snow, and off-road conditions. But the 275/65r20 extra clearance provides an advantage, and both handle adverse conditions well.

Speedometer Difference

At an actual speed of 20 mph, the speedometer reads 21.36 mph with 275/65r20 tires vs. 20 mph with 275/55r20. The larger diameter causes 275/65r20 speedometers to read 0.66 mph higher.

How Tall Is A 275/65r20 Tire?

The 275/65R20 tire has a height, also known as the overall diameter, of approximately 34.1 inches or 866 mm. The sidewall of the tire is about 7 inches or 178.8 mm. The tire is designed to fit a 20-inch wheel rim.

What Does Tire Size 275/55r20 Mean?

The tire size 275/55R20 provides specific information about the dimensions and construction of the tire. Here’s a breakdown of each part of the code:

• 275: This number represents the width of the tire in millimeters. In this case, the tire is 275 millimeters wide.
• 55: This number is the aspect ratio, which is the ratio of the tire’s height to its width. In this example, the height is 55% of the tire’s width.
• R: This letter indicates that the tire has a radial construction.
• 20: This number represents the diameter of the wheel (rim) in inches.

Our Observation
Based on the comparisons, the 275/65r20 offers a more cushioned ride and increased ground clearance, while the 275/55r20 provides sharper handling and superior fuel economy.

The choice comes down to ride comfort versus sporty responsiveness. Both tires deliver robust real-world performance regardless of aesthetic preference for taller or lower sidewalls. Carefully weigh your priorities to pick the best tire for your needs.

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