The first portion of a tire size index indicates the Width of that tire. As you can see, the first portion of one tire is 245 and the other is 265. It means that the Width of the tire 245 75R16 is 245 millimeters and the tire 265 70R16 is 265 millimeters. So the difference in their Widths is 265 – 245 = 20 millimeters.
5124. Better Fuel Economy Factory Ratios Increased Power. vs 285/70-17. 265/65-R17 tires are 0.91 inches (23 mm) smaller in diameter than 245/75-R17 tires and the speedometer difference is 2.9%.
If you think your Avalanche is getting okay mileage now (most likely between 15-18 highway), you're going to hurt it worse by using those tires. The ones you want to use are shorter overall. Secondly, since they are skinnier tires, by two centimeters, you won't have as much grip and possibly stability as you do now. A 265 tire requires a larger rim diameter (as you’ve seen on the table) than a 245 tire does. The volume of air is smaller in this case. A 245 high-profile tire has more space for the air in it than a 265 low-profile tire. So, the narrower one becomes softer than the wider one and brings driving comfort. However, a wider tire lets you turn
245/65-R17 tires are 1.02 inches (26 mm) smaller in diameter than 265/65-R17 tires and the speedometer difference is 3.4%.
Both in the table and in the graph, the tires are compared according to the following indicators: overall diameter, section width, circumference, sidewall height and clearance. Also, the online application calculates the difference in real speed and speedometer readings if the difference between tire 265/70 R17 and tire 245/65 R17 is significant.
While the 245 and 255 tires differ in width—the 255 is slightly wider—they also have different speed tolerances. These variations make each type more suited for specific driving conditions and vehicles. Other key factors to consider include aspect ratio, speed rating, and rim diameter.
Here’s a list of differences between 255 and 265 tires. Different wheel diameter; 265 tires use more gas mileage; Different load indexes between the two tires; 265 tires are more stable than 255 tires; A 265 tire has higher rolling resistance than a 255 tire; Different wheel diameter. 255 tires fit on 15 inches rims while 265 tires for on 16
--- almost everyone there has been through 265/70's! I ran them for 2 years, just wanted bigger gaterose build thread-- gater has great explanations of 265/70's momo.75's '03 Sport 4.7L V8 Build-- Momo has a good write up with them. Speedo 5% off, ride difference will depend on tire, if u stick with P rated it won't be any difference really.
dLXoOM.
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    • difference between 265 and 245 tires