Tire Size Box

265/70R14 vs 265/80R14

265/80R14 compared with 265/70R14

+7.3% diameter, 0.0" width

265/80R14 is 30.69" tall vs 28.61". More than the 3% rule of thumb, so check carefully before switching.

28.6"14" rim7.3"10.4" wide
265/70R14 (solid) compared with 265/80R14 (dashed outline), drawn to scale

With 265/80R14 tires, when your speedometer says 60 mph you are really going

64.4 mph

265/80R14 is +2.09 inches (+7.3%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/70R14265/80R14Difference%
Overall diameter28.61"30.69"+2.09"+7.3%
Section width10.43"10.43"0.00"0.0%
Sidewall height7.30"8.35"+1.04"+14.3%
Circumference89.87"96.42"+6.56"+7.3%
Revolutions per mile705.0657.1−47.9−6.8%

Speedometer difference

If your vehicle came with 265/70R14 and you fit 265/80R14, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.5 mph+1.5 mph
30 mph32.2 mph+2.2 mph
40 mph42.9 mph+2.9 mph
50 mph53.6 mph+3.6 mph
60 mph64.4 mph+4.4 mph
65 mph69.7 mph+4.7 mph
70 mph75.1 mph+5.1 mph
75 mph80.5 mph+5.5 mph
80 mph85.8 mph+5.8 mph

Each size on its own

Questions

Which is bigger, 265/70R14 or 265/80R14?
265/80R14 is taller by 2.09 inches (30.69" vs 28.61"). 265/70R14 is the same width.
Can I replace 265/70R14 with 265/80R14?
It is not recommended without checking carefully. The diameter difference is +7.3%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 265/80R14 change my speedometer?
When your speedometer reads 60 mph with 265/80R14 fitted (calibrated for 265/70R14), your real speed is 64.4 mph. Your odometer will under-count miles by about 7.3%.
Will 265/80R14 lift my vehicle?
Ride height changes by half the diameter difference: +1.04 inches of ground clearance at the axle.

Other comparisons