Tire Size 255/70r17 vs 285/70r17

The main difference between the two tire sizes is that the 285/70r17 is wider than the 255/70r17. The 285/70r17 tire size is around 30 millimeters wider than the 255/70r17 tire size.

This means that the 285/70r17 tire will provide a wider contact patch with the road, which can improve handling and cornering performance.

255/70r17 vs 285/70r17

Here’s a comparison table that will help you easily understand the differences between the options.

Fitment Guide

When replacing tires, the new tires should be within 3% of the original tire’s overall diameter to avoid clearance issues or speedometer errors.

The 285/70r17 is 5.3% larger in overall diameter than the 255/70r17, so it may require modifications like a suspension lift to fit appropriately and prevent rubbing at complete turn.

Larger tires, like the 285/70r17, may need more room to fit without scraping or rubbing.

Ground Clearance

The 285/70r17 provides 1.65 inches (42mm) more ground clearance than the 255/70r17, which is beneficial for off-road driving over rough terrain.

However, the larger diameter causes a lower speedometer reading. The 255/70r17 has less clearance, increasing risks of scraping, but gives a higher speedometer reading.

Gas Mileage

The 285/70r17 larger size and heavier weight results in slightly worse gas mileage than the 255/70r17.

The 255/70r17 smaller contact patch and lower rotational mass improve fuel efficiency, which is ideal for daily driving.’s

Ride Comfort

The 255/70r17 offers a slightly firmer, sportier ride, while the 285/70r17 provides more cushioning and impact absorption from its taller sidewall.

This makes the 285/70r17 more comfortable over very uneven roads or rugged terrain.

Aesthetics

Visually, the 285/70r17 has a modestly taller sidewall than the 255/70r17, giving it a slightly more aggressive, off-road look.

The 255/70r17 has a lower profile appearance that some prefer for a sportier look.

Handling & Stability

The 255/70r17 provides crisper handling and steering response on pavement due to its shorter, stiffer sidewall.

The 285/70r17 flexible sidewall reduces handling precision slightly but offers better stability off-road.

Noise & Vibration

Due to its stiff sidewall, the 255/70r17 transmits more road noise and vibration. The 285/70r17 dampens noise and vibration better through its additional air volume and sidewall flex. However, both are relatively quiet and smooth.

Durability & Wear

The 255/70r17 exhibits slightly more even treadwear and a marginally longer lifespan. The heavier 285/70r17 causes more wear on vehicle components, but its larger size can better withstand impacts.

Adverse Conditions

The narrower 255/70r17 in snow may cut through to the pavement more effectively.

The wider 285/70r17 provides better traction in muddy or loose dirt conditions. Both perform well in rain, snow, and off-road.

Speedometer Difference

Due to its larger overall diameter, the 285/70r17 causes the speedometer to read slightly higher than the actual speed compared to the 255/70r17.

At 20 mph actual speed, the 285/70r17 reads 21.06 mph while the 255/70r17 reads 20 mph.

How Much Bigger Is A 285 Tire Than A 255?

The 285/70R17 tire is approximately 1.65 inches (42 mm) bigger in diameter than the 255/70R17 tire . This difference in tire diameter also results in a 5.0% to 5.1% variance in the speedometer reading.

Our Observation
Regarding comparing 255/70r17 vs 285/70r17 tires, the 285/70r17 is better suited for off-roading and rugged terrain with its added ground clearance, cushioned ride, and improved traction.

However, the 255/70r17 is ideal for street driving thanks to its responsive handling, even treadwear, and fuel efficiency.

Though differences are modest between 255/70r17 vs 285/70r17, we’d recommend the 285/70r17 for truck or SUV owners who frequently go off-road.

For commuter vehicles and street driving, the 255/70r17 is likely the better choice for its blend of ride comfort, longevity, and efficiency. Select tires based on your intended driving conditions.

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