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Size comparisons

265/75R16 vs 33x12.50R16 — the Frontier's tall option against a real 33

A D40's taller factory tire measured against the imperial size it sits closest to, on a 16-inch wheel.

265/75R1631.65 in tall10.43 in wide33x12.50R1633.00 in tall12.50 in wide+1.35 in · +4.27%
Drawn to scale from the size codes. Solid outline is 265/75R16; dashed outline is 33x12.50R16. The bars below each tire are section width at the same scale.

33x12.50R16 is 1.35 in taller than 265/75R16 (4.27%) and 2.07 in wider. A speedometer calibrated for 265/75R16 would under-read by 4.27%.

Measured against each other

  • Overall diameter

    31.65 in33.00 in+1.35 in (+4.27%)

  • Section width

    10.43 in / 265 mm12.50 in / 318 mm+2.07 in (+19.81%)

  • Sidewall height

    7.82 in8.50 in+0.68 in

  • Circumference

    99.4 in103.7 in+4.2 in

  • Revolutions per mile

    637.2611.2-26.1

  • Ride height at the axle

    ——+0.68 in

  • Speedometer reading

    ——+4.27% under-read

Calibrated for 265/75R16, running 33x12.50R16

Dial reads 30
31.3 mph
Dial reads 50
52.1 mph
Dial reads 70
73.0 mph
Odometer counts 100
104.3 mi covered

Change either size in the comparison tool, or see the full speed table in the speedometer error calculator.

The taller of the Frontier's two factory sizes is 1.35 in short of a 33 — which is closer than most factory tires get, and not close enough to call the two interchangeable.

What the gap consists of

  • Overall diameter: 31.65 in to 33.00 in, +1.35 in, +4.27%
  • Section width: 10.43 in to 12.50 in, +2.07 in, +19.81%
  • Sidewall: 7.82 in to 8.50 in, +0.68 in

The width change is bigger in absolute inches than the height change, and it is nearly five times larger as a proportion. On a mid-size pickup, that is the figure that determines whether the swap happens.

Sixteen inches is a lot of sidewall

Both of these tires carry over 7.8 in between the rim and the road, which is more than any 17-inch or 20-inch tire of comparable diameter can offer. That is the enduring advantage of the 16-inch wheel, and it is why owners of trucks from this era are often reluctant to move up.

The flotation size's derived aspect ratio is 68, against the metric size's stated 75. Close enough that the two casings are similar in shape as well as in height — more so than the equivalent pairing on a 17-inch wheel manages.

The readings

A Frontier on 3.73:1 gears would need 3.89:1 to leave engine speed untouched, and 3.91:1 is the closest set anyone makes — which on a truck of this size and age is a conversion nobody performs for four per cent.

Left alone, it reads as a needle three miles an hour light at motorway pace.

The rim these tires sit on

Frontiers of this generation left the factory on 16-inch wheels. That is a diameter, and it is the only wheel dimension a fitment record or a size code carries; how wide those wheels are is not recorded here and is not derivable from either 265/75R16 or 33x12.50R16. It matters because the flotation casing is 2.07 in wider in nominal terms, and the wider the casing the more of its final shape the wheel decides. On a rim narrower than its reference the tread edges tuck under, which costs width and hands a little back as height: below 12.50 in across, above 33.00 in tall. Both of the page's headline gaps move as a result, in opposite directions: the 2.07 in of width closes a little and the 1.35 in of height opens a little. By how much is a tape-measure question.

The narrower way to the same height

There is no widely available narrow 33 on a 16-inch wheel, which is the practical constraint here. The nearest metric approach is 285/75R16 at 32.83 in, only 0.17 in short of the flotation size and 1.28 in narrower — a substantially better match than the 265 on both counts, and the size most owners in this position end up choosing.

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