Tire Size 285/70r17 vs 275/70r18

The main difference between tire sizes 285/70R17 and 275/70R18 lies in their width and diameter. The 285/70R17 is wider by 10mm and has a smaller diameter of 11.4mm compared to the 275/70R18.

Tire 1 Front View
Tire 2 Front View
Tire 1 Side View
Tire 1 Wheel
circumference 1
Tire 2 Side View
Tire 2 Wheel
/ R
/ R
Parameter235/35 R18205/40 R18Differ.
Tire Height
Section Width
Sidewall Height
Rim Size



The 285/70r17 has a width of 11.22 inches and a diameter of 32.71 inches. The 275/70r18 is slightly narrower at 10.83 inches wide, with a diameter of 33.16 inches.

The 275/70r18 is within 3% of the 285/70r17’s overall diameter, meaning it can directly replace it without adaptation needed.

Ground Clearance

With a diameter of 33.16 inches, the 275/70R18 provides 1.08 inches more ground clearance than the 285/70R17.

This added clearance is useful for off-road driving, helping avoid scrapes over terrain. However, it causes a slightly lower speedometer reading.

Fuel Efficiency

The narrower 275/70R18 has a smaller contact patch and lower rotational mass, improving fuel efficiency compared to the wider 285/70R17. This saves on gas costs for daily driving.

Ride Comfort

The 275/70R18’s taller 70 aspect ratio sidewall cushions bumps better than the 285/70R17. Its extra flex absorbs road impacts, providing a smoother ride over uneven surfaces.


The shorter sidewall of the 285/70R17 offers quicker steering response and handling precision on pavement compared to the 275/70R18. However, both deliver responsive handling.

Noise & Vibration

The 285/70R17’s stiffer sidewall transmits more road noise and vibration into the cabin. The 275/70R18’s extra sidewall flex dampens noise and vibration better.


The narrower 275/70R18 may exhibit more even treadwear and a longer lifespan. The wider 285/70R17 is heavier, adding stress and wear on components.

Adverse Conditions

Performance in rain, snow, and off-road is very similar. The 275/70R18’s extra clearance provides a slight advantage, while the 285/70R17 is a bit more responsive. Both handle adverse conditions well.

Speedometer Difference

At a vehicle speed of 20 mph, the speedometer reading will be slightly different between 285/70r17 and 275/70r18 tires. The 285/70r17 tires with a larger diameter will register a speedometer reading of 20 mph.

However, the 275/70r18 tires with a smaller diameter will register a reading of 20.27 mph at the same actual vehicle speed. This speedometer discrepancy is due to the minor difference in tire diameters between the two sizes.

Alternative for 285/70r17
There are several alternative tire sizes available to replace 285/70R17, and you can utilize a table chart to compare them.

Tire SizeOverall DiameterDifference
235/80R1731.8″ (808 mm)-2.9%
345/55R1732″ (812 mm)-2.4%
255/75R1732″ (814 mm)-2.2%
275/70R1732.2″ (818 mm)-1.7%
305/65R1732.6″ (828 mm)-0.5%
235/85R1732.8″ (832 mm)0%
255/80R1733.1″ (840 mm)1%
295/70R1733.3″ (846 mm)1.7%

Alternative for 275/70r18
There are several options available if you are seeking alternative tire sizes to replace 275/70R18. You may use a table chart to compare these options.

Tire SizeOverall DiameterDifference
305/60R1832.4″ (823 mm)-2.4%
285/65R1832.6″ (827 mm)-1.9%
265/70R1832.6″ (829 mm)-1.7%
375/50R1832.8″ (833 mm)-1.2%
295/65R1833.1″ (841 mm)-0.2%
325/60R1833.3″ (847 mm)0.5%
305/65R1833.6″ (853 mm)1.2%
285/70R1833.7″ (857 mm)1.7%

285/70r17 vs 275/70r18

285/70r17 vs 275/70r18

This table shows a comparison of the two tire sizes and helps you to decide which one is better for you

Our Observation
Based on the comparisons, the 285/70R17 is best suited for responsive on-road handling and improved fuel economy thanks to its shorter sidewall and narrower width. Meanwhile, the 275/70R18 excels at off-road traction and absorbs bumps better for a smoother ride thanks to its additional sidewall flex.

For mixed driving conditions, we recommend the more well-rounded 275/70R18 size – the extra ground clearance and cushioning provide versatility without sacrificing much on-road performance. Its added traction also gives more capability in rain or snow.

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