Tire Size 275/70r18 vs 275/65r20

The main difference between the 275/70r18 and 275/65r20 tires is in the sidewall height. The tire size 275/70r18 is around 0.54 inch taller than the 275/65r20 tire size. This impacts various performance factors between the two tire sizes.

275/65r20 vs 275/70r18

This table provides an easy-to-comprehend comparison of the differences.

Fitment Guide

The new set should be within 3% of the original tire’s overall diameter when replacing tires to avoid clearance issues or speedometer inaccuracies.

The 275/65R20 is 2.8% larger in overall diameter than the 275/70R18, so it falls within the acceptable range.

However, the taller 275/70R18 may require minor adaptations like a small lift kit to prevent rubbing at full turn.

Ground Clearance

With a diameter of 34.07 inches, the 275/65R20 provides 1.01 inches more ground clearance than the 33.16 inch 275/70R18.

This added clearance helps prevent scrapes and damage over rough terrain. However, the larger 275/65R20 diameter causes a lower speedometer reading than the 275/70R18.

275 65r20 in inches

Gas Mileage

The 275/70R18’s smaller contact patch and lighter weight provide slightly better fuel efficiency over the larger 275/65R20.

Reduced rolling resistance and rotational mass allow it to confer a modest gas mileage benefit, making it ideal for daily driving.

Ride Comfort

The extra 0.54 inches of sidewall cushioning enables the 275/70R18 to absorb bumps and cracks more smoothly.

Its flexible sidewall dampens road impacts versus the shorter 275/65R20 sidewall, leading to a more comfortable ride over uneven surfaces.

Aesthetics

Visually, the difference is subtle. The 275/70R18’s taller 70 aspect ratio gives it a slightly “stretched” look over the 275/65R20.

This taller sidewall aesthetically suits trucks and SUVs better than a lower-profile tire.

275 65r20 in inches

Handling & Stability

The 275/65R20’s shorter sidewall provides sharper handling and quicker response on the pavement.

Meanwhile, the 275/70R18’s additional flex absorbs impacts better, delivering good stability off-road. Both offer responsive handling overall.

Noise & Vibration

With a shorter and stiffer sidewall, the 275/65R20 transmits more road noise and vibration into the cabin. The 275/70R18’s extra sidewall flex helps dampen vibrations, leading to a smoother and quieter ride.

Durability & Wear

The 275/65R20’s smaller size can promote more even treadwear and slightly longer-lasting treads. The larger 275/70R18 is more heavily stressed and can cause added wear on suspension components.

Adverse Conditions

Both tires handle rain, snow, and off-road conditions well. The 275/70R18’s extra ground clearance gives a slight advantage off-road, while the 275/65R20 is a bit more responsive in snow due to its shorter sidewall.

Speedometer Difference

At an actual speed of 20 mph, the speedometer reads 20.55 mph with 275/65R20 tires versus 20 mph with 275/70R18 tires.

The larger diameter 275/65R20 causes a higher speedometer reading of 0.55 mph than the smaller 275/70R18 at the same actual speed.

Can I use 225/45R17 instead of 215/45r17?

The 215/45r17 tire has an overall diameter of 24.62 inches (625.3 mm), and the 225/45R17 tire has a diameter of 24.97 inches (634.3 mm).

The difference in diameter between these two tire sizes is around 0.35 inches (or 9 mm), equating to a 1.4% difference.

Since this is less than the recommended maximum difference of 3%, using a 225/45R17 tire instead of a 215/45r17 is possible.

Can I put a 225/45R17 on a 215/45r17?

Whether you can mount a 225/45R17 tire on a 215/45r17 depends on the rim width range. The recommended rim width range for the 215/45r17 tire is 7.0-8.0 inches, while for the 225/45R17 tire, the range is slightly wider, between 7.0-8.5 inches.

Given these specifications, it should be possible to mount a 225/45R17 tire on a rim designed for a 215/45r17, as long as the rim width is within the specified range.

Our Observation
Regarding comparing the 275/65R20 and 275/70R18 tire sizes, both deliver solid performance with minor differences.

The 275/65R20 provides slightly increased ground clearance and sharper handling, while the 275/70R18 offers a more comfortable ride quality and improved fuel efficiency.

For most drivers, the 275/70R18’s smoother ride and efficiency make it the best choice overall. The small sacrifice in handling precision outweighs the 275/70R18’s gas mileage and absorbing ride.

We recommend the 275/70R18 for its blend of comfort, visual appeal, and efficiency across various conditions.

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