What is the difference between 245 75R16 and 265 70R16? which one is heavy-duty performance?

265 70r16 vs. 245 75r16 is a critical discussion to have when one is thinking about switching. People often change tiers to check the experiences with different levels since the tier will be added so their specifications will get some variation.

As for this tier, they have considerable differences in width. Also, they share the differences in aspect ratio, height, and some other specifications. However, they have the same rim diameter and construction. So, let’s see whether they are suitable to switch.

265 70r16 vs 245 75r16

Even if one has a car that carries high technology, it will not move an inch without a tire. So, it is the crucial part of the car that people cannot ignore. The primary function of the tire is to support the weight of the vehicle.

Also, it will absorb the shocks of the road. Besides, those will transmit traction torque. After that, those will brake forces to the road surface to maintain the balance and change the direction of the road. These are the most essential yet basic functions of the tire in a car.

To fulfill these four needs, engineers selected high-grade heavy-duty resilient rubber. They filled the tire with compressed air for accurate performance in the construction. As for the attachment with the car, the wheel has an inner and outer rim to hold it.

One may have seen the metal part of a wheel. This is the rim that holds the tire with the car. The edge is attached to the vehicle with heavy-duty attachment nuts.

When selecting a tire for the car and the quality, the size of the tire is the significant part. If one is familiar with the size index, they will know the letters and numbers. Those indicate so much about the tire.

If one is not familiar with the terms, this article will help understand everything about it. The times 265 70r16 and 245 75r16 indicate the size index of the tire. Those numbers and letters indicate the wide of the tire. As well as the aspect ratio and sidewalls of it.

One has to understand those to select the exact tire for their car. Because these numbers are essential to fit the tire in the vehicle. However, people often query the differences between the 265 70r16 and 245 75r16 shares.

Initially, we can say that the difference is in the size index. They have some significant differences. Before going any further, one must know which letter means what in size indexing. If we break size index 265 70r16 and 245 75r16, we will get,

–265 or 245 indicates the width of the tire in meters. 

— 70 or 75 means the aspect ratio of the height or width of the tire.

— R stands for construction type of tire.

–Finally, 16 indicates the Rim diameter in inches of the tire.

If we compare 265 70r16 and 245 75r16, we will compare the terms below.


As the first part of the terms indicates the tire’s width, the terms 265 70r16 and 245 75r16 have 265 in first. That means there is some difference in width between this two. Because they share different numbers. One is 265, and another one is 245. Since the tire’s width is measured in millimeters, we can say they differ by 20 millimeters wide.

One does not have to confuse about the way of measuring the width. Because the manufacturer measures the tire’s width with highly accurate instruments, they measure the width from one sidewall to another. Since the tire’s width is similar, one can select any of the two in terms of width.

Aspects Ratio

In terms of aspect ratio, one will find a massive difference between 265 70r16 and 245 75r16. The second term of the number is the aspect ratio. So, for the tire format 265 70r16, the aspect ratio is 70. Meanwhile, for 245 75r16, the aspect ratio is 75.

In the automobile industry, the aspect ratio is calculated in percentage. So, the tire 265 70r16 has a 70% aspect ratio. But, on the other hand, the tire 245 75r16 has a 75 aspect ratio. So, the aspect ratio of these two has difference of 5, which is a big deal in terms of tire size index.

Because the vertical cross-section of the tire is divided by the width to calculate the aspect ratio, a change of a bit can make huge differences and create significant effects.

Construction Type

One can say the construction type of the tire by letter in the size index of the tire. Generally, the tire size index can have two construction-type letters. They can find it in the sidewalls of the tire.

The letters are,

R- The letter R indicates the radial type of the tire.

B- It indicates the tire is a bias-ply type or cross-ply type.

As for 265 70r16 and 245 75r16, both have the letter R. Both tires have radial-type construction. So, there is no difference in construction type in both tires because both have radial type construction.

Rim Diameter

The wide-open part inside the tier is the rim diameter. By this part, one has to attach the tire with the rim. Usually, the rim diameter is calculated in inches. The last part of the size index indicates the Rim diameter.

Considering the given size index of 265 70r16 and 245 75r16, we have 16 inches rim diameter for both tires. Therefore, there are no differences in rim diameter between these two. So, both of them will be perfectly fit in 16 inches rim.

Let’s have a look into the differences in technical specifications.

Diameter inches (mm)30.61 (777.4)30.47 (773.9)-0.14 (-3.5) -0.5%
Width inches (mm)10.43 (265)9.65 (245)-0.79 (-20) -7.5%
Circum. inches (mm)96.15 (2442.27)95.72 (2431.28)-0.43 (-11) -0.5%
Sidewall Height inches (mm)7.3 (185.5)7.23 (183.75)-0.07 (-1.75) -0.9%
Revolutions per mile (km)658.95 (409.45)661.93 (411.31)2.98 (1.85) 0.5%

As we can see from the comparison table above, both tire shares several differences in some criteria. Firstly, 265 70r16 and 245 75r16 share -0.5% differences in terms of Diameter. Secondly, in the circumstances, the tires have -0.5% differences.

Thirdly, in sidewall height, they have -0.9% differences. The significant difference is in width, and it is -7.5%. Finally, the last difference is in revolution per mile, 0.5%.

What will be the speedometer differences for 265 70r16 and 245 75r16tires?

Speedo ReadingActual Speed
20 mph (32.19 km/h)19.91 mph (32.04 km/h)
25 mph (40.23 km/h)24.89 mph (40.05 km/h)
30 mph (48.28 km/h)29.86 mph (48.06 km/h)
35 mph (56.33 km/h)34.84 mph (56.07 km/h)
40 mph (64.37 km/h)39.82 mph (64.08 km/h)
45 mph (72.42 km/h)44.8 mph (72.09 km/h)
50 mph (80.47 km/h)49.77 mph (80.11 km/h)
55 mph (88.51 km/h)54.75 mph (88.12 km/h)
60 mph (96.56 km/h)59.73 mph (96.13 km/h)
65 mph (104.61 km/h)64.71 mph (104.14 km/h)
70 mph (112.65 km/h)69.68 mph (112.15 km/h)
75 mph (120.7 km/h)74.66 mph (120.16 km/h)
80 mph (128.75 km/h)79.64 mph (128.17 km/h)
85 mph (136.79 km/h)84.62 mph (136.18 km/h)
90 mph (144.84 km/h)89.59 mph (144.19 km/h)

Can one replace265 70r16 with 245 75r16?

While one decides to switch from one tier to another, the main feature that comes to the front is the width and rim diameter of the tier. If one is thinking about switching between 265 70r16 and 245 75r16, one may look for the possible risk and harm.

Luckily, both of the tier’s rim diameters are the same. So there will be no problem with fitting. However, the tier has differences in width aspect ratio, which will not impact safety.

Therefore, one can switch the tier if it is necessary. However, they should stick to the exact specification as to their old tier. In case the switching is mandatory, they can choose the similar one.


Whether it is a truck or a passenger car, the Tiers of the vehicle are the crucial part. Even if the engine is the strongest and the driver is the expert, the whole thing will go wrong if the tier is wrong. 265 70r16 vs. 245 75r16 will tell people about the possible differences the same rim diameter can have.

Since these two-tier types share so many differences, one may have thought it could be wrong to switch. However, this is not the proper thought for every time. Since they share quite a difference in width, it may cause a problem in weight lifting. However, everything else is fine.

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