Hello Projocs03,
Tires are typically measured tire width (sidewall)/tire ride height/wheel size. The differences of the two tire sizes you published are .4 of an inch difference in width/sidewall. And about .55 in over all diameter which would impact you revs per rotation. Depending on your wheel size.
Attached is a comparison of the two given the variable of 17" rim.
Stock Tire
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Tire 1 - 255/70R17
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Tire 2 - 265/70R17
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Section Width:
-
-
Section Width:
10.03 in
255 mm
Section Width:
10.43 in
265 mm
Rim Diameter:
-
-
Rim Diameter:
17 in
431.8 mm
Rim Diameter:
17 in
431.8 mm
Rim Width Range:
Rim Width Range:
6.5 - 8.5 in
Rim Width Range:
7 - 9 in
Overall Diameter:
-
-
Overall Diameter:
31.05 in
788.67 mm
Overall Diameter:
31.60 in
802.64 mm
Sidewall Height:
-
-
Sidewall Height:
7.02 in
178.30 mm
Sidewall Height:
7.30 in
185.42 mm
Radius:
-
-
Radius:
15.52 in
394.20 mm
Radius:
15.80 in
401.32 mm
Circumference:
-
-
Circumference:
97.54 in
2477.5 mm
Circumference:
99.27 in
2521.4 mm
Revs per Mile:
-
Revs per Mile:
669.8
Revs per Mile:
658.2* Source http://www.1010tires.com/TireSizeCalculator.asp?action=submit
I added the above link so you can research further or change any variables you need to know. However, the most important thing to understand is the impact of your speedometer. Different sizes will have different impacts. For example going to a bigger tire will show a slower speed on your spedo that your traveling.
Good luck
About half of 1 inch in height. The first number on the tire is the measurement from side to side ( or shoulder ) in millimeters. The second number is the percentage in hight to width ( so 70% as high as it is wide ) and then the last number is rim height in inches.
10 milliters
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