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255/70R17 in inches

A 255/70R17 tire is 31.1″ tall and 10.0″ wide, and fits a 17″ wheel. In inches it is written 31.1×10.0R17.

Diameter31.06″
Width10.04″
Sidewall7.03″
255/70R17 drawn to scale: 31.06 inch diameter, 7.03 inch sidewall, 17 inch wheel, 10.04 inch tread width17″ wheel7.03″31.06″ overall10.04″ wideSide view
Drawn to scale. Nominal dimensions calculated from the size code.
Manufacturer data

How tall 255/70R17 tires really are

Heights published by BFGoodrich, General, Michelin and Toyo for all 12 tires in this size. Their published revolutions per mile work out to 30.1–30.2″ under load (below).

Real 255/70R17 tires measure 31.10–31.10″, against 31.06″ from the size code. Every one runs taller than the size code.

Height under load30.1–30.2″

Published revs per mile (668–669) mean the tire rolls like a 30.1–30.2″ tire on the vehicle. Use this for speedometer calibration.

Weight spread31.7–50.4 lb

The lightest (General Grabber HTS, SL) is 18.7 lb lighter per corner than the heaviest (BFGoodrich All-Terrain T/A KO3, LT D).

12 tires in 255/70R17

Sort by the spec you care about.

LoadRevs/miSource
General Grabber HTSTouringSL · 112S31.1031.711.02,469669Spec page
Toyo Open Country H/T IIHighwaySL · 112T31.1035.512.02,469668Spec page
Michelin Defender LTX M/S 2All-seasonXL · 116T31.1036.012.52,756669Spec page
BFGoodrich Advantage Control HTHighwaySL · 112T31.1036.112.02,469669Spec page
Toyo Open Country A/T IIIAll-terrainSL · 112T31.1037.513.22,469668Spec page
General Grabber APTAll-terrainSL · 112T31.1038.214.02,469669Spec page
BFGoodrich Trail-Terrain T/AAll-terrainSL · 112T31.1041.512.52,469669Spec page
General Grabber A/TSportAll-terrainLT C · 110T31.1042.214.02,335669Spec page
BFGoodrich Trail-Terrain T/A+SL · 112T31.1042.412.52,469669Spec page
General Grabber A/TXAll-terrainSL · 112S31.1044.114.02,469669Spec page
Toyo Open Country A/T IIIAll-terrainLT E · 121/118S31.1047.416.33,195668Spec page
BFGoodrich All-Terrain T/A KO3All-terrainLT D · 116S31.1050.415.02,755669Spec page

Is 255/70R17 a 31-inch tire?

≈31″

Yes. The size code works out to 31.06″, and the 12 tires here publish 31.10″, so people call it a 31.

All 31-inch tire sizes, on every wheel size.

Compare with nearby sizes

Differences in overall diameter, calculated from each size code.

SizeDiameter ″vs 255/70R17Difference
225/75R1730.29-0.77″-2.5%
245/70R1730.50-0.55″-1.8%
265/65R1730.56-0.49″-1.6%
235/75R1730.88-0.18″-0.6%
275/60R1830.99-0.06″-0.2%
255/65R1831.05-0.00″-0.0%
275/65R1731.07+0.02″+0.1%
245/75R1731.47+0.41″+1.3%
265/70R1731.61+0.55″+1.8%
235/80R1731.80+0.75″+2.4%

How to read 255/70R17

How to read any tire size

255/70R17 112T as printed on the tire sidewall, with each part numbered255/70R17 112T123456
How 255/70R17 112T is printed on the sidewall. It's the most common code among the 12 tires here (6 of them); tires in this size come in other load and speed ratings too.
1255Section width

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

270Aspect ratio

A percentage, not a measurement: the sidewall is 70% as tall as the tire is wide, which is 178.5 mm or 7.03 inches.

3RConstruction

Radial construction.

417Wheel diameter

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

5112Load index

Each tire carries up to 2,469 lb (1,120 kg) at its maximum pressure.

6TSpeed rating

Rated for up to 118 mph sustained.

SpecificationInchesMetric
Overall diameter31.06789 mm
Section width10.04255 mm
Sidewall height7.03178.5 mm
Circumference97.62,478 mm
Revolutions per mile (calculated, unloaded)649.4404 per km
Revolutions per mile (published by manufacturers)668–669415–416 per km
Approved wheel width6.5–8.5165–216 mm

Speedometer error after switching to 255/70R17

Your actual speed– mph

Questions about 255/70R17

What is 255/70R17 in inches?

31.06 inches tall, 10.04 inches wide, on a 17-inch wheel. Written in inches, that is roughly 31.1×10.0R17.

How much does a 255/70R17 tire weigh?

Between 31.7 lb and 50.4 lb for the 12 tires listed here. The lightest is the General Grabber HTS (SL); the heaviest is the BFGoodrich All-Terrain T/A KO3 (LT D).

What wheel width do I need for 255/70R17?

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

How many revolutions per mile does a 255/70R17 make?

Published figures run 668–669 revolutions per mile. The calculated figure is 649.4, but manufacturers measure the tire under load, where it rolls on a smaller radius.

What is the difference between P255/70R17 and LT255/70R17?

Passenger tires (9 here) are built for passenger loads, with max loads of 2469–2756 lb. Light-truck tires (3 here) come in heavier load ranges with max loads of 2335–3195 lb, and are usually heavier with deeper tread.

How much taller is 255/70R17 than 235/75R17?

0.18 inches taller on paper (31.06″ vs 30.88″), which raises the axle about 0.09″. Your speedometer will read about 0.6% slow.