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255/80R17 in inches

A 255/80R17 tire is 33.1″ tall and 10.0″ wide, and fits a 17″ wheel. In inches it is written 33.1×10.0R17.

Diameter33.06″
Width10.04″
Sidewall8.03″
255/80R17 drawn to scale: 33.06 inch diameter, 8.03 inch sidewall, 17 inch wheel, 10.04 inch tread width17″ wheel8.03″33.06″ overall10.04″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 255/80R17 tires really are

Heights published by BFGoodrich and Toyo for all 5 tires in this size. Their published revolutions per mile work out to 32.1–32.3″ under load (below).

Real 255/80R17 tires measure 33.07–33.31″, against 33.06″ from the size code. They run both taller and shorter than the size code.

  1. Toyo Open Country M/T33.31″ +0.24″
  2. BFGoodrich HD-Terrain T/A KT33.10″ +0.04″
  3. Toyo Open Country R/T Pro33.10″ +0.04″
  4. Toyo Open Country A/T III33.07″ +0.01″
  5. Toyo Open Country R/T Trail33.07″ +0.01″
Each bar runs from the size code's 33.06″ (the orange line) to the model's published height. The track spans 1.0″. Where a model comes in several load ranges, the darker part shows its range of heights; the number after the name is how many versions it comes in.
Height under load32.1–32.3″

Published revs per mile (624–629) mean the tire rolls like a 32.1–32.3″ tire on the vehicle. Use this for speedometer calibration.

Weight spread50.5–61.4 lb

The lightest (Toyo Open Country A/T III, LT E) is 10.9 lb lighter per corner than the heaviest (Toyo Open Country M/T, LT E).

5 tires in 255/80R17

Sort by the spec you care about.

LoadRevs/miSource
Toyo Open Country A/T IIIAll-terrainLT E · 121/118R33.0750.516.33,195628Spec page
Toyo Open Country R/T TrailRugged-terrainLT E · 123/120Q33.0751.716.33,415628Spec page
Toyo Open Country R/T ProRugged-terrainLT E · 123/120Q33.1056.217.13,415628Spec page
BFGoodrich HD-Terrain T/A KTLT E · 123Q33.1057.218.03,415629Spec page
Toyo Open Country M/TMud-terrainLT E · 121/118Q33.3161.418.33,195624Spec page

Is 255/80R17 a 33-inch tire?

≈33″

Yes. The size code works out to 33.06″, and the 5 tires here publish 33.07–33.31″, so people call it a 33.

All 33-inch tire sizes, on every wheel size.

A true 33×12.50R17 is 0.06″ shorter on paper and 2.5″ wider.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 255/80R17Difference
305/65R1732.61-0.45″-1.4%
285/70R1732.71-0.35″-1.1%
33×12.50R1733.00-0.06″-0.2%
33×15.50R1733.00-0.06″-0.2%
33×15.50R1633.00-0.06″-0.2%
33×12.50R1833.00-0.06″-0.2%
255/85R1633.07+0.00″+0.0%
295/70R1733.26+0.20″+0.6%
305/70R1733.81+0.75″+2.3%
285/75R1733.83+0.77″+2.3%

How to read 255/80R17

How to read any tire size

LT255/80R17 123/120Q as printed on the tire sidewall, with each part numberedLT255/80R17 123/120Q1234567
How LT255/80R17 123/120Q is printed on the sidewall. It's the most common code among the 5 tires here (2 of them); tires in this size come in other load and speed ratings too.
1LTLight truck

Marks a light truck (LT) tire.

2255Section width

255 mm across the widest point, or 10.04 inches. Every 255 size

380Aspect ratio

A percentage, not a measurement: the sidewall is 80% as tall as the tire is wide, which is 204.0 mm or 8.03 inches.

4RConstruction

Radial construction.

517Wheel diameter

Mounts on a 17-inch wheel. Approved wheel widths run 6.5″ to 8.5″.

6123/120Load index

Each tire carries up to 3,415 lb (1,550 kg) on its own, or 3,085 lb (1,400 kg) each when paired on a dual rear axle.

7QSpeed rating

Rated for up to 99 mph sustained.

ELoad range

Printed separately as "LOAD RANGE E": a 10-ply rating, inflated up to 80 psi (standard load-range table). The load range E tires here carry up to 3,415 lb each, as published.

SpecificationInchesMetric
Overall diameter33.06840 mm
Section width10.04255 mm
Sidewall height8.03204.0 mm
Circumference103.92,638 mm
Revolutions per mile (calculated, unloaded)610.0379 per km
Revolutions per mile (published by manufacturers)624–629388–391 per km
Approved wheel width6.5–8.5165–216 mm

Speedometer error after switching to 255/80R17

Your actual speed– mph

Questions about 255/80R17

What is 255/80R17 in inches?

33.06 inches tall, 10.04 inches wide, on a 17-inch wheel. Written in inches, that is roughly 33.1×10.0R17.

How much does a 255/80R17 tire weigh?

Between 50.5 lb and 61.4 lb for the 5 tires listed here. The lightest is the Toyo Open Country A/T III (LT E); the heaviest is the Toyo Open Country M/T (LT E).

What wheel width do I need for 255/80R17?

Manufacturers approve 6.5–8.5″ wide wheels for this size.

How many revolutions per mile does a 255/80R17 make?

Published figures run 624–629 revolutions per mile. The calculated figure is 610.0, but manufacturers measure the tire under load, where it rolls on a smaller radius.

How much taller is 255/80R17 than 33×15.50R17?

0.06 inches taller on paper (33.06″ vs 33.00″), which raises the axle about 0.03″. Your speedometer will read about 0.2% slow.