Tire Size 285/75r17 vs 285/70r17
The main difference between the 285/75r17 and 285/75r17 tires is the sidewall height. This means that the 285/75r17 tire has a sidewall about 0.56 inches taller than the 285/70r17 tire.
| / | R |
| / | R |
| Parameter | 235/35 R18 | 205/40 R18 | Differ. |
|---|---|---|---|
| Tire Height | |||
| Section Width | |||
| Circumference | |||
| Sidewall Height | |||
| Revolutions | |||
| Rim Size |
Fitment Guide
The 285/75r17 is around 3.3% larger in overall diameter than the 285/70r17. This crosses the 3% diameter difference threshold that requires consideration of fitment adaptations.
Larger tires like the 285/75r17 may require a leveling kit or lift to prevent rubbing or fitment issues. The 285/70r17 does not present any fitment challenges.
Ground Clearance
With a diameter of 33.83 inches, the 285/75r17 provides 1.12 inches more ground clearance versus the 285/70r17 at 32.71 inches.
The added clearance is useful for off-roading by helping avoid scrapes over obstacles. However, the larger diameter causes a lower speedometer reading on the 285/75r17.
Gas Mileage
The 285/70r17’s smaller contact patch and lower rotational mass improve fuel efficiency compared to the 285/75r17.
The larger tire’s additional rolling resistance and weight reduce gas mileage. This makes the 285/70r17 better for daily driving from a fuel economy standpoint.
Ride Comfort
The taller sidewall and diameter on the 285/75r17 provide better impact absorption and a smoother ride over uneven terrain.
The 285/70r17 offers a marginally smoother ride on paved roads but transmits more vibration and harshness from cracks and bumps.
Aesthetics
The visual difference between the sizes is subtle. The 285/75r17 will have a slightly taller sidewall, giving a “stretched” look that can suit trucks aesthetically. The lower profile 285/70r17 has a more car-like appearance.
Handling & Stability
The shorter sidewall and smaller diameter of the 285/70r17 allow quicker steering response and handling precision.
The taller 285/75r17 sidewall reduces handling responsiveness slightly but provides stability, particularly off-road.
Noise & Vibration
The stiffer 285/70r17 sidewall transmits more road noise and vibration into the cabin. The extra sidewall flex of the 285/75r17 absorbs more noise and vibration for a smoother, quieter ride.
Durability & Wear
The 285/70r17’s smaller contact patch and diameter may promote more even treadwear and longer life. The larger 285/75r17 endures more impact, but its added weight causes more wear on suspension components.
Adverse Conditions
In snow or ice, the narrower 285/70r17 can cut through to the pavement more effectively.
Given its larger footprint, the wider 285/75r17 provides better hydrophobic and mud-terrain traction. Both handle adverse conditions well overall.
Speedometer Difference
The speedometer reading for tires sized 285/75r17 is slightly higher than for 285/70r17 tires. At an actual vehicle speed of 20 mph, the speedometer reads 20 mph with 285/75r17 tires.
But with 285/70r17 tires, the speedometer reads 19.34 mph at the same actual vehicle speed. The difference in speedometer reading between these two tire sizes is 0.66 mph.
What Does 285/70r17 Tire Mean?
The numbers and letters in a tire size refer to the tire’s width, height, and diameter. The first number, 285, refers to the tire’s width in millimeters.
The second number, 70, is the aspect ratio. This is the height of the sidewall expressed as a percentage of the width. In this case, the sidewall is 70% as tall as the tire’s width.
The last number, 17, is the diameter of the wheel in inches. Last but not least, the letter R indicates the tire construction type. In this case, R means radial tire. The tire size 285/70R17 is equal to 32.8×11.2R17 in inches.
What Does 285/75r17 Tire Mean?
The tire size “285/75R17” indicates a 285mm wide radial tire with a 75% aspect ratio designed for a 17-inch wheel. This size is also equivalent to 33.9×11.2R17 in inches.
The 285/75r17 tire is a large SUV and light truck tire. It’s commonly used on the Nissan Armada, RAM 1500, and Toyota Tundra.
Can I Use 285/70r17 Instead of 285/75r17?
No, using 285/70r17 instead of 285/75r17 results in a 3.3% smaller diameter. Generally, it’s not advised to deviate by more than 3%.
This variance may affect speedometer accuracy and handling. Ensure the substitute tire meets or exceeds the load capacity of the original for safe usage.
How Wide Is A 285/70r17 Tire?
The tire size 285/70R17 signifies a width of 285 millimeters, measured from the inner sidewall to the outer sidewall of the tire.
This width measurement is a key parameter providing information about the tire’s dimensions and is an essential factor in ensuring compatibility with the corresponding wheel and vehicle specifications.
285/70r17 vs 285/75r17
This comparison table can provide you with a clearer comprehension of the distinctions between the tire sizes of 285/75r17 and 285/70r17.
How Much Taller Is A 285/75r17 Tire Than A 285/70r17?
The tire size 285/75r17 is 1.12 inches (28.5 mm) taller than the 285/70r17 tire. This increase in height represents a 3.3% increase in diameter.
The 285/75r17 tire has a height of 33.83 inches (859.3mm), while the 285/70r17 is smaller with a height of 32.71 inches (830.8mm).
What Size Rim For 285/70r17?
The 285/70r17 tire is typically mounted on a 17-inch rim. Therefore, the recommended rim size for a 285/70r17 tire is a 17-inch diameter rim.
The ideal rim width for a 285/70R17 tire is typically in the range of 7.5 to 9 inches. A rim with a width within this range will ensure proper fitting and performance of the tire.
What Size Rim For 285/75r17?
The recommended rim size for a 285/75r17 tire is typically a 17-inch diameter rim. The recommended rim size for a 285/75r17 tire is between 7.5 inches and 9.5 inches in width.
Our Observation
After comparing the specifications, I recommend the 285/75r17 as the best overall choice. Its larger diameter and taller sidewall provide a smoother ride, better ground clearance for off-roading, and a rugged aesthetic that suits trucks and SUVs well.
While the 285/70r17 edges out in on-road handling and fuel efficiency, the difference seems minor. For most drivers who value comfort and moderate off-road capability, the benefits of the 285/75r17 are more impactful.
Its larger size adds versatility without significantly sacrificing performance. Ultimately, it comes down to priorities, but the 285/75r17’s balance of capability makes it my top recommendation for most needs. I would equip my truck with this size for daily driving and weekend adventures.
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.
I have a 2022 jeep gladiator rubicon with factrory 285 70 17 tires. Would I be required to install a lift kit if I put 285 75 17 tires on the vehicle?
The overall diameter of 285/75r17 is about 3.3% larger than 285/70r17, which exceeds the 3% diameter threshold. A lift kit is not required, but there may be some rubbing at full lock.