Tire Size Box

265/75R14 vs 265/85R14

265/85R14 compared with 265/75R14

+7.0% diameter, 0.0" width

265/85R14 is 31.74" tall vs 29.65". More than the 3% rule of thumb, so check carefully before switching.

29.6"14" rim7.8"10.4" wide
265/75R14 (solid) compared with 265/85R14 (dashed outline), drawn to scale

With 265/85R14 tires, when your speedometer says 60 mph you are really going

64.2 mph

265/85R14 is +2.09 inches (+7.0%) in overall diameter. That is more than the 3% most shops and makers recommend.

265/75R14265/85R14Difference%
Overall diameter29.65"31.74"+2.09"+7.0%
Section width10.43"10.43"0.00"0.0%
Sidewall height7.82"8.87"+1.04"+13.3%
Circumference93.15"99.70"+6.56"+7.0%
Revolutions per mile680.2635.5−44.7−6.6%

Speedometer difference

If your vehicle came with 265/75R14 and you fit 265/85R14, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.4 mph+1.4 mph
30 mph32.1 mph+2.1 mph
40 mph42.8 mph+2.8 mph
50 mph53.5 mph+3.5 mph
60 mph64.2 mph+4.2 mph
65 mph69.6 mph+4.6 mph
70 mph74.9 mph+4.9 mph
75 mph80.3 mph+5.3 mph
80 mph85.6 mph+5.6 mph

Each size on its own

Questions

Which is bigger, 265/75R14 or 265/85R14?
265/85R14 is taller by 2.09 inches (31.74" vs 29.65"). 265/75R14 is the same width.
Can I replace 265/75R14 with 265/85R14?
It is not recommended without checking carefully. The diameter difference is +7.0%, 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 265/85R14 change my speedometer?
When your speedometer reads 60 mph with 265/85R14 fitted (calibrated for 265/75R14), your real speed is 64.2 mph. Your odometer will under-count miles by about 7.0%.
Will 265/85R14 lift my vehicle?
Ride height changes by half the diameter difference: +1.04 inches of ground clearance at the axle.

Other comparisons