Tire Size 285/75r17 vs 285/70r17
The main difference between tire sizes 285/75r17 and 285/70r17 lies in their overall diameter and sidewall height. This translates to a 3.3% difference in overall tire diameter between the two sizes, with the 285/75r17 being noticeably larger both in terms of diameter and sidewall.
285/75r17 vs 285/70r17
This comparison table can provide you with a clearer comprehension of the distinctions between the tire sizes of 285/75r17 and 285/70r17
| 285/75R17 | 285/70R17 | Difference |
|---|---|---|
| Tire Height 33.83″ | Tire Height 32.71″ | -1.12 inch |
| Tread Width 11.22″ | Tread Width 11.22″ | 0″ (0 mm) |
| Sidewall Height 8.42″ | Sidewall Height 7.85″ | -0.56 inch |
| Circumference 106.28″ | Circumference 102.76″ | -3.53 inch |
| Revolutions per mile 596 | Revolutions per mile 616 | 20.45 |
| Radial Tire | Radial Tire | No Difference |
| Rim Size 17 inch | Rim Size 17 inch | No Difference |
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.
Alternative for 285/75R17
There are several alternative tire sizes to replace 285/75R17, and a comparison table can help you choose from the various options available.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 255/80R17 | 33.1″ (840 mm) | -2.3% |
| 295/70R17 | 33.3″ (846 mm) | -1.6% |
| 305/70R17 | 33.9″ (860 mm) | 0% |
| 275/80R17 | 34.3″ (872 mm) | 1.4% |
| 295/75R17 | 34.4″ (874 mm) | 1.6% |
| 315/70R17 | 34.4″ (874 mm) | 1.6% |
Alternative Tire Size for 285/70R17
Numerous alternative tire sizes are obtainable to substitute 285/75R17, and you can make use of a table chart to assess and compare them.
| Tire Size | Overall Diameter | Difference |
|---|---|---|
| 235/80R17 | 31.8″ (808 mm) | -2.9% |
| 345/55R17 | 32″ (812 mm) | -2.4% |
| 255/75R17 | 32″ (814 mm) | -2.2% |
| 275/70R17 | 32.2″ (818 mm) | -1.7% |
| 305/65R17 | 32.6″ (828 mm) | -0.5% |
| 235/85R17 | 32.8″ (832 mm) | 0% |
| 255/80R17 | 33.1″ (840 mm) | 1% |
| 295/70R17 | 33.3″ (846 mm) | 1.7% |
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.
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.
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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.