285/70R17 Vs 33×12.5R17 Tires

Tire size and fitment become confusing for many vehicle owners due to the tire’s different measurement styles.

There are two ways to measure tires: one is metric, and another is imperial.

Comparing 285/70R17 and 33×12.5R17 tires is a bit difficult for general people because the first measure is in the metric system, and the second measure is in the imperial system.

That’s why I have talked about the differences between 285/70R17 and 33×12.5R17 tires in this post.

The comparison will help you understand the difference between the two tires and select the suitable one for you.

What Does 285/70R17 Mean

The 285/70R17 indicates tire size and construction information.

The tire is measured in a metric system where “285” indicates the tire’s width is 285 mm (11.2 inches).

The “70” indicates the tire’s aspect ratio, which is 70 percent of the tire’s width.

The letters “R” stand for redial, and the number “17” denotes that the tire will fit perfectly on a wheel with a 17-inch diameter.

The tire is equal to 32.8×11.2R17 inches.

What Size Tire is a 33 12.50 R17

The 33×12.5R17 indicates tire measurement in the imperial system.

The size of the 33×12.5R17 tire measurements are:

  • 33: The diameter of the tire is 33 inches (838.2 mm)
  • 5: The width of the tire is 12.5 inches (318 mm)
  • R: Redial construction
  • 17: Fit in a 17-inch wheel.

The 33×12.5R17 tire is equal to 315/65R17 in the metric system.

285/70R17 vs 33×12.5R17 Tires [9 Differences and Similarities]

The primary difference between 285/70r17 and 33×12.5r17 tires is width. The 33×12.5r17 tire is 1.3 inches (33.02 mm) wider than the 285/70r17 tire. This small difference has a major impact on the vehicle’s performance and other capabilities.

I have made a table for you to give you a clear basic concept of 285/70R17 and 33×12.5R17 tires.

Parameter

285/70r17 33×12.5r17

Difference

Diameter

32.7 inches (830.58 mm) 33 inches (838.2 mm)

0.9%

Tire Width

11.2 inches (285 mm) 12.5 inches (318 mm)

11.6%

Sidewall Height

7.9 inches (200 mm) 8 inches (203 mm)

1.3%

Circumference

102.8 inches (2610 mm) 103.8 inches (2632 mm)

0.9%

Revolutions per Mile

616.9 611.5

5.4

Speedometer Diff Ratio

1.00 1.01

1%

Price

$199-$254 $226-$368

$27-$114

I have discussed 9 basic differences between these tires to clear your confusion.

1. Fitment

The diameter of the 33×12.5R17 tire is around 1% larger than 285 70R17.

As a 3% difference from the original diameter is safe, the 33 12.5R17 can be swapped with 285/70R17 tires.

The swapping process can easily be done without any rubbing or clearance problems.

But a leveling kit will be required to accommodate the extra height.

2. Fuel Efficiency

33x12.5r17 vs 285/70r17

A vehicle’s tire widths affect its fuel efficiency. If the tires are wider, it increases rolling resistance on the road.

As a result, the fuel economy slightly decreases.

The 33×12.5R17 tires are wider than the 285/70R17 tires.

Therefore, using a 33×12.5R17 tire will decrease fuel mileage slightly.

3. Ground Clearance

33x12 5r17 vs 285 70r17

The 285/70R17 tire height is 32.7 inches. On the other hand, the 33×12.5R17 tire’s height is 33.02 inches.

The 33×12.5R17 tire is 0.32 inches (8mm) taller.

Therefore, 33×12.5R17 provides a slightly better off-roading capability than 285 70R17 tire.

However, the extra height reduces the speedometer reading by up to 1 percent.

4. Ride Quality

Tire size greatly affects the vehicle ride quality. If a tire is wider and has a large sidewall, it can absorb more bumps and obstacles on the road.

As a result, passengers get more comfortable riding in the vehicle.

Narrow and lower sidewall tires make more jerks and vibrations on the road.

The sidewall height of a 33×12.5R17 tire is 8 inches, and 285/70R17 is 7.9 inches.

Therefore, a vehicle with 33×12.5R17 tires provides a slightly more comfortable ride than a vehicle with 285/70R17 tires.

5. Load Capacity

The maximum load capacity of 33×12.5R17 tires is 3,085 pounds.

In contrast, 285/70R17 has a maximum load capacity of 3195 or 2910 pounds, depending on the vehicle and wheel configuration.

6. Controlling

Typically, stiffer and shorter sidewall tires provide better vehicle control.

Therefore, the 285/70R17 has a slightly powerful control and low response timing.

On the other hand, the 33×12.5R17 tire’s taller sidewall provides better stability on off-roading.

But its control and responsiveness are slightly lower than 285 tires.

7. Performance

In general, there is no difference between the two tires’ performance.

They are perfect for driving in snow, off-road, and rainy conditions.

However, a very experienced driver states that the 33×12.5R17 tires provide a little more traction control and better response on rainy roads.

But this is not a noticeable factor for regular driving.

8. Interior Noise and Vibration

A thicker sidewall allows a tire to absorb more noise and vibration than a normal tire.

The 33×12.5R17 tire has a thicker sidewall than the 285 70R17.

As a result, the 33×12.5R17 tire-equipped vehicle’s passengers experience less noise and vibration than the 285/70 tire-equipped vehicle.

9. Appearance

Many drivers love the 33×12.5R17 tire appearance because of its larger, rectangular profile and noticeable tread.

The tire is suitable for both SUVs and trucks.

In contrast, the 285/70R17 has a rounder and classical look.

FAQs

How to determine tire size?

There are 4 easy ways to determine a tire size:

  1. Find out the tire size through the vehicle owner’s manual.
  2. Check the tire sidewall. A tire’s dimensions, number, and series of letters are typically painted on the tire’s sidewall.
  3. Check on the vehicle glove box or door jamb.
  4. The final way to find tire size is by searching on the manufacturer’s website.

What size rim for 285/70r17?

For the 285/70R17 tire, the “17” indicates rim size.

So, the tire is designed for a 17-inch rim size.

And according to the Tire and Rim Association (TRA),, the recommended rim size for a 285/70R17 tire is between 7.5 and 9.5 inches in width.

Will 33×12.5R17 fit 285/70R17?

Yes, 285/70R17 is replaceable with a 33×12.5R17 tire without any modifications.

This is because both tires have a diameter difference of 1%, which obeys the recommended range.

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