Tire Size 265/70r18 vs 265/65r18

Understanding tire sizes can be a daunting task, especially if you’re not familiar with the numbers and letters on the sidewall of the tire. It’s important to consider several factors to ensure that you get the best performance and longevity from your investment. We’ll be comparing two common tire sizes, 265/70r18 and 265/65r18, to help you make an informed decision.

265/70r18 vs 265/65r18 Table

This table offers a side-by-side comparison of tire sizes 65/70r18 and 265/65r18 to assist you in understanding the differences between them.

Diameter31.56 in32.61 in1.04 (3.3%)
Width10.43 in10.43 inSame
Circum.99.16 in102.44 in3.28 (3.3%)
Sidewall Height6.78 in7.3 in0.52 (7.7%)
Revolutions638.98618.5320.45 (3.2%)

Alternative Tire Size of 265/70r18
As a general rule, any alternative tire size you choose should have an overall diameter that is within 3% of the original tire’s diameter. This will ensure that the speedometer and odometer readings remain accurate and that the overall performance of your vehicle is not affected.

Tire SizeOverall DiameterDifference
235/75R1831.9″ (809 mm)-2.4%
255/70R1832.1″ (815 mm)-1.7%
275/65R1832.1″ (815 mm)-1.7%
305/60R1832.4″ (823 mm)-0.7%
285/65R1832.6″ (827 mm)-0.2%
375/50R1832.8″ (833 mm)0.5%
295/65R1833.1″ (841 mm)1.4%
275/70R1833.2″ (843 mm)1.7%
325/60R1833.3″ (847 mm)2.2%
305/65R1833.6″ (853 mm)2.9%

Tire Size Alternative 265/65R18
To ensure compatibility, replacement tires must not exceed a 3% difference in overall diameter from the original tires.

Tire SizeOverall DiameterDifference
235/70R1831″ (787 mm)-1.7%
275/60R1831″ (787 mm)-1.7%
255/65R1831.1″ (789 mm)-1.5%
225/75R1831.3″ (795 mm)-0.7%
285/60R1831.5″ (799 mm)-0.2%
245/70R1831.5″ (801 mm)0%
235/75R1831.9″ (809 mm)1%
275/65R1832.1″ (815 mm)1.7%
255/70R1832.1″ (815 mm)1.7%
305/60R1832.4″ (823 mm)2.7%

Overall Diameter
One of the most significant differences between these two tire sizes is the overall diameter. The 265/70r18 has a larger diameter of 31.56 inches compared to the 265/65r18, which has a diameter of 32.61 inches.

This means the 265/70r18 will have a slightly taller and wider profile than the 265/65r18. The 265/70r18 will be a better option if you’re looking for more ground clearance.

Tread Width
The tread width is another crucial aspect to consider when choosing a tire. The 265/65r18 has a slightly narrower tread width of 10.43 inches compared to the 265/70r18, which has a tread width of 10.43 inches.

The difference in tread width may not seem significant, but it can affect the vehicle’s handling and stability on the road. The 265/70r18 offers better traction and handling, making it an excellent option for off-road driving.

Rim Diameter
The rim diameter is the wheel size to which the tire will fit. The 265/65r18 and 265/70r18 have a rim diameter of 18 inches. This means that either tire will fit onto an 18-inch wheel.

Sidewall Height
The sidewall height is the distance from the rim to the tread. The 265/65r18 has a sidewall height of 6.78 inches, while the 265/70r18 has a slightly taller sidewall height of 7.3 inches.

A taller sidewall height can provide better cushioning and absorb more shock from rough road conditions. However, a shorter sidewall can improve handling and stability, especially in sharp turns and high-speed driving.

The circumference of a tire is the measurement around the tire’s outside edge, while revolutions refer to the number of times the tire rotates per mile. The 265/70r18 has a circumference of 102.44 inches and completes 618.53 revolutions per mile, while the 265/65r18 has a circumference of 99.16 inches and completes 638.98 revolutions per mile. The difference in revolutions can affect the vehicle’s speedometer and odometer readings.

Our Observation
The choice between the 265/70r18 and 265/65r18 tire sizes comes down to your specific needs and driving style. If you prioritize off-road driving and ground clearance, then the 265/70r18 is an excellent option. On the other hand, if you value better handling and stability, then the 265/65r18 is a better choice.

Ultimately, the tire size you choose will have a significant impact on your vehicle’s overall performance, including fuel efficiency, acceleration, and braking. Therefore, it’s essential to consider all the factors, such as overall diameter, tread width, rim diameter, sidewall height, circumference, and revolutions, before making a final decision.

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